We know we're in Terrance Dicks' capable hands when Liz is introduced to us as 'good-looking in a rather severe way.'
The space programme is emphatically the European Space Programme throughout. Cornish's calmness is constantly mentioned - and he's also 'well aware of his good looks.'
When Liz returns to the laboratory with a cuppa for the Doctor, she finds him hunched over the telly, 'as if he wanted to climb inside to the Control Room'. The TV presenter is called Michael Wakefield, not John Wakefield.
The Doctor tells the soldiers that he doesn't approve of passes, not that he doesn't believe in them. (I wouldn't normally mention such triviala but this is a very close adaptation so far).
Cornish is persuaded to accept the Doctor's help because he feels 'the full impact of the Doctor's personality, a blend of formidable intelligence and tremendous charm.'
We get the Brigadier's military appreciation of the warehouse battle; he soon realises that the enemy are excellent shots, but seem to be trying not to hit his men.
In the scene where he abruptly orders Taltallian to help the Doctor, Cornish gets one back against the latter in personality terms: 'Cornish showed irritation so seldom that it was all the more effective,' we're told, and it leaves the Doctor somewhat nonplussed.
More soldierly thinking from the Brig when he immediately grasps the Doctor's warning about the gun-toting Taltallian being frightened: 'Nothing was more dangerous than a gun in the hand of a frightened man who was unused to firearms.'
Transmigration of object is a Time Lord technique 'somewhere between telekinesis and conjuring'.
When the Doctor tricks the captive Collinson into revealing his military training, he uses the parade-ground manner he learned at Waterloo.
Once the Doctor and Liz have worked out that the computer's been sabotaged by Taltallian, programmer Dobson sets to work to get it fixed.
TD is keen to make it clear that that Space Control were properly prepared to recover the capsule - the Recovery Team were in place on the heathland, and have already removed the parachutes and put it onto the lorry when the principals arrive.
The Brigadier doesn't like Bessie being involved in the convoy, as she 'lowered the military tone'.
After the Brigadier and Doctor have left the ministry, and Taltallian has emerged from hiding, his conversation with Sir James (Minister for Science and Technology) has an extra element where he demands that Sir James finds him a place to hide. He's told that he can stay at the Ministry.
Carrington's secret laboratory is in a Nissen hut at a top secret government research institute. His scientist Heldorf is a former refugee, hence the accent.
The Doctor counters Quinlan's point about the public becoming panic-stricken by suggesting that in a democracy they have a right to know. Carrington makes an interesting reply: 'Democracy can have disadvantages, Doctor. What we are doing is for the best.' That's an echo of the rhetoric used by Col David Stirling types who were becoming active at the time the story was written.
Reegan is introduced by a bit of back-story: he is indeed supposed to be Irish, but he had to leave the country after a difference of opinion with the IRA. (He was robbing banks on their behalf and hanging on to too much of the proceeds). Since then he's been a successful criminal in the US and elsewhere.
Heldorf and his colleague resist the thugs (fatally) because they've sussed out what Reegan means by 'when you've finished here.'
Reegan's van has decals for 'HEYHOE LTD, LAUNDERERS' and 'SILCOX BAKERIES' - not quite as seen on screen. He deliberately put his henchmen in the back with the ambassadors, to see how deadly they were. And of course now he doesn't have to pay them.
The Brigadier doesn't ask Carrington about who knew the location of Heldorf's laboratory. When the General apologises to the Doctor, he does so with 'that sudden diffidence of his'.
Lennox's laboratory is situated in an abandoned army bunker. He was stripped of his degrees for falsifying his experimental results - and sacked for falsifying the accounts of his college. That's academics for you.
Quinlan and Carrington have a longer discussion about how to deal with the situation. The General offers to arrest Cornish, but Quinlan says it would cause a scandal which could bring down the Government. They also speculate about who kidnapped the ambassadors: it could be any of Britain's enemies, or any of its allies. (Bit of politics there).
Reegan doesn't just put gloves on to venture into the isolation chamber, he goes out to his van and gets the radiation suit (would have looked boring on screen I suppose).
Liz runs across the bridge at the weir because she can see there are people about on the other side. 'Her high white boots weren't really meant for running,' remarks the narrator. That could have been said a good few times in the UNIT years. She's doing pretty well on screen though.
Taltallian and Cornish's conversation about the M3 fuel variant is mostly given in summary, as are several of the other duller bits of dialogue in the story. It's always a sign that TD is on form when he applies a bit of judicious compression.
Lennox makes a 'pathetic attempt at dignity' when Liz asks him if he's a prisoner, saying that he can come and go as he pleases, but 'I haven't anywhere to go.' (Rather undoes the impact of 'Where would I go?' a few lines later.)
When the escaping Liz decides to thumb a lift the narrator suggests her motivation: 'Not usually a difficult task for an attractive long-haired girl in a mini-skirt.' On her recapture, she manages to convince Reegan that the door was left unlocked - but only because he thinks his henchman is too stupid to be relied on. He doesn't reproach her for locking Lennox in with the ambassadors.
Reegan got Liz to work on the communication device because, in an echo of his words to Lennox earlier, he's 'no kind of scientist.'
The Brigadier is delayed in following the Doctor to the Ministry after Sir James' phone call, because he gets another call informing him about the ambassador attack on the Space Centre.
In the conversation after the ambassador returns to Reegan's bunker, the exchange about unfortunately not having been able to kill the Brigadier is omitted. Liz doesn't do the cheeky 'I won't hurt you' line.
There's what looks like a transcription error in Cornish's reports from control to capsule: 'Thirty, three oh' and 'Fifty, five oh' are rendered as 33 and 55.
The Doctor wishes the decontamination room had so much as a few dog-eared issues of Punch in it.
Carrington doesn't ask the Brigadier any awkward questions about the Doctor's origins. Back at the bunker, his statement that Reegan disobeyed his order to kill the Doctor is delivered 'as if Reegan had forgotten to polish his boots.' Similarly, his remark about not being paid to think is 'in the best army tradition.'
The Doctor has a moment of reflection before he says goodbye to the ambassadors - on the theme that this is the first formal contact between humans and intelligent aliens. I like the way TD has given some thought to this, so I'm not going to quibble about the Cyber-invasion and the Nestenes. He means 'formal' as in 'not consisting of "Surrender, humans, or die"'.
TD also wants to answer the question 'Why don't we see the Ambassadors and their species again now that contact has been made?' The Doctor thinks:
After the fright they'd given each other the two species would probably keep well apart. The galaxy was big enough for both of them, after all.
When I acquired this Target I wondered if it would be an 'Inferno' or a 'Time Monster' in the late adaptation stakes - a classic or a workmanlike job. It's definitely closer to an 'Inferno', I would have really enjoyed this had it been available in my original Targeteering days.