The mentioned "Fohn-Fighter" is probably named after the "Föhn" ("Foehn"), a warm wind in southern Bavaria/Germany, which causes severe indisposition to many people there.
An almost identical plot is in the Starsky and Hutch episode 90 Ibs of Trouble (1979)
Hotel room is The London Tara, Kensington W8.
Lewis Collins reverts to his Liverpudlian accent when confronted by Mrs Hope in her house.