It transpires that Control believed one of four senior figures in the service was in fact a Russian agent - a mole - and the Hungary operation was an attempt to identify which of them it was.Smiley had been forced into retirement by the departure of Control, but is asked by a senior government figure to investigate a story told to him by a rogue agent, Ricky Tarr, that there was a mole.This was like the Attack Force set in that it contained several ready-made tanks etc., and a vacu-formed base which included the world's smallest harbour.
Beach-Head Invasion Set Also known to exist, but apparently never appearing in any catalogue, was a similar set entitled 'Beach-Head Invasion Set'.
It does not appear in their first catalogue, produced in 1962, so perhaps pre-dates that, and the like would not appear again (although you could always choose to pair the animal set with the much later Waterloo farmhouse of course). This was the first battle set to appear in an Airfix catalogue (the fourth edition - 1967).
The above image comes from their fifth edition catalogue (which had better photography and was the first in colour).
Airfix have a long and reasonably glorious history of making battlesets.
From their point of view it was a relatively cheap way to make a new product, sometimes requiring no more than the design of some new packaging, but for many a small boy such sets were a wonderful if often unobtainably expensive toy which seemed to deliver an entire battle in one box.