The requirement in the UK is detailed in CAP413 -
"1.9.6 Aircraft in the heavy wake turbulence category shall include the word ‘HEAVY’
immediately after the aircraft callsign in the initial call to each ATSU. The purpose of
this call is to confirm the aircraft type and/or wake turbulence category is the same as
that stated on the flight progress strip. For the A380 the word "SUPER" is to be
included after the callsign on initial contact."
although I agree it doesn't get used as much in Europe as the US - maybe it should be?