There was a problem with the reCAPTCHA system (the bit that makes people type in the words from an image to prevent spam bots from registering). It was reported to me this evening and fixed.
Apologies to anyone who was unable to register recently while this was broken. Please try again, you should be able to register now.
Apologies to anyone who was unable to register recently while this was broken. Please try again, you should be able to register now.