Al E. Vator
Why does the UK allow these practice 121.5 calls? Why not say use 123.45 or a dedicated frequency?
If you had read the thread properly; you would have realised that 121.5 MHz is the UK dedicated frequency on VHF. Covered by Autotriangulation equipment. ( Radio Direction Finding Equipment )
Other VHF frequencies are not covered by this National System.
This has been the case in the UK for many years and remains so!
Most misuse of the frequency is down to so-called professional pilots not checking what frequency they are about to transmit on or those making childish animal noises etc.
Be advised, if you are in UK airspace you can instantly be identified and should be fined for misuse of the frequency.