Problems registering at www.ais.org.uk

Hello all,I'm having a lot of problems registering at www.ais.org.uk. In fact, I'm now on my 4th attempt to register but I've not been able to do it yet.The problem is that the site seems to reject any username I use, and I've tried a lot of combinations of letters and numbers. I also tried to register in both the "British Isles only service" and the "UK and Foreign States service", but still get the same result.The error messages I get are:1) Field ; illegal length of the field; the field must contain up to 5 20.2) Field ; illegal length of the field; the field must contain up to 3 50.Could someone help me on this username problem? I would really appreciate it!Thanks in advance!