It's not RADAR you prat, it's RDF (Radio Direction Finding) and it was the Chain Home system which implemented RDF.

Later after the cavity magnetron had been 'given' to the yanks it became RADAR.

Bloody yanks, come over here, take our women, all that candy, gum and nylons, and what about that devils brew coca cola, what's wrong with proper luke warm flat beer? eh eh!!!

#%&*$# it, I'm retiring to Bournmouth.

P.