A few weeks ago it took us 14minutes to check in on a London frequency. Eastbound over the top of Stansted we selected the freq abeam Heathrow and finally managed to get our callsign heard as the east coastline approached. First time I've seen it really really stupidly busy.
I tip my hat to the controller though - I couldn't keep that up for more than 5 minutes without totally losing it.
Cheers
WWW