Thank you VIVA GT, for the clarification on recognition of the use of intercoolers on turbo cars in Britain. I was quite sure that Volvo did their homework when homologating their evolution during 1983, but can't find the word intercooler anywhere in homologation form A5020, as the regular 240 Turbo road car didn't have an intercooler, as far as I know:
https://historicdb.fia.com/car/volvo-240-turbo-2127
Jesper