In reply to StefanB:
The 7d is an absolutely stonking camera. Really tough, pretty weather resistant and takes stunning photos. Autofocus is amazing and shooting rate as quick as you need. It lags behind modern cameras on high ISO performance, though up to 3200 shots are pretty clean, and video is not as good as modern bodies. I have one and am a huge fan, as are many surf photographers. £300 would give you enough almost for a second hand Canon 17-40 F4L lens which is a perfect partner to the 7d. Matches roughly 24-70 on a full frame. Go for it.