I watched it and enjoyed it , however nothing was mentioned about the Japanese invasion , I would wager it was Japanese imports that done for the British motor industry more so than the Germans , especially as most people couldnt afford a BMW or Audi , Mercedes or Porsche - only really a VW - and it was before PCPs and easy finance.
As for Top Gear I found it strange they didnt mention Vauxhall at all , the Astra is produced in Elsmere Port and the Vivaro in Luton , also no mention of MG Motor UK at Longbridge , I know those cars are nominally built in China but they do enough in Longbridge to qualify the cars for a UK Built marker on the VIN. (I did notice on Das Auto , they said that MG Rover was Chinese , alas MG Rover died in 2005 along with most of the Longbridge plant and 6000 jobs)