Practice Pan X 3 make me furious to be honest. Chose another parallel frequency for these calls. While trying to hear my LHR approach calls on a very busy/already congested frequency, to be punctuated with a(nother) pointless 121.5 call is a flight safety issue. As a global operator, Europe has become the worst 121.5 congested frequency of pointless calls. The U.K. Needs to realise that it appears to have the worst record of all for 121.5 "blocks" of the main frequency.