Look what Santa deposited in my sock.
It seems to differ from the other 2009 versions of the P100: the two headphone sockets, one for high impedance headphones and the other for low, has been replaced with one socket and an impedance selector switch; it has five settings, ranging from 300ohms to 18-24ohms.
I have about 60hrs on it now, and it is a beautiful sounding amp - one of the best I have heard, even with the stock Chinese tubes.
Some better tubes are now on the cards - this amp definately deserves them.
My P100 was purchased from CATTYLINK for £166 (plus pretty hefty shipping charges).