Anyway, chances are that the school is full, but will have less in the year than at the start of Y7, so you'd have a reasonable chance at an appeal (assuming he passes whatever test they set).
Actually, there are more boys in Y8 at Tommies than there were at the start of Y7, because a few extra boys started at the beginning of Y8, whereas only one had left during Y7. So the answer is: yes, the school does accept boys in Y8 and presumably in Y9 too. There is definitely some kind of test. I don't think it's a VR test though. The idea, I believe, is to ensure that anyone joining the school later on will be working at the same level as the average child already there. I'm sure if you ring the school office they will be able to fill you in on all the details.