Neil - it could be an Australian import. They had a similar spec to Europe (208bhp) but called their Impreza Turbo a WRX. There were several differences, off the top of my head I can remember the lack of headlamp washer squirters on the front bumper and the other being the lack of a bright button on the centre console to reduce the brightness of the digital clock.
Check the VIN. If it starts with JF2GC8 then it is very likely that the car originated from Australia. Normally it should be JF1GC8 where the 1 designates passenger vehicle, but in Australia 1=FWD and 2-AWD.
Steve