Some stores are already advertising "new 7 strings due early 2003" or words to that effect, but they were in the 2002 catalogue so you might find one hanging around.
My first port of call would be the "superstores" like "Acadamy of Sound" or "Sound Control" which have many branches spread out over the UK and might be able to find one for you. Other places to try include Nevada and the Guitar and Keyboard Centre (GAK) who both usually have a lot of guitars in stock.
If that fails hang around ****, both here and in the States, The dollar's at about 1.6 to the pound so now is a good time to import second hand from the US
