Its a complete pain the backside and its not even necessary - there are plenty of alternative freqs in the spectrum if you dig around.
Only on Sunday I was over Welshpool (albeit at 30-odd thousand) and I called them on 123.25 just to say Hi as an ex-instructor there. It was real nice until Pembleshem or some similar sounding airfield asked me to shut up as I was interfering with their tower freq!
Roll on digital radio I say.
WWW