Hi, you posted a message onto my profile but I can't seem to reply to you, so I'll just put mine here instead.
Sorry to hear you didn't get an offer from Cambridge! I wasn't actually given a reason why I was rejected, but I personally am not too bothered about it. For the record, I got 3 A*s at A-level and I'm now studying a MEng Computer Science course at UCL.
You say that you're thinking of taking a gap year and then applying to Oxford. I personally would say that you shouldn't get too hung up on trying to get an Oxbridge degree, because honestly, even during and after your course, it will
not matter at all. Most employers in CS will check that you have a degree of some kind and then make sure you do well in a technical interview. They realise that actual understanding (as well as good communications skills) are far more important than where you spent your last three/four years.
I am extremely happy with my course, and I get a lot of industry contact. Wherever you end up, make sure that you sign up for some hackathons (they're free and great fun!), where you'll get the chance to meet lots of interesting people from across the country and build great stuff. You may also bring yourself to the attention of the sponsors, potentially, although hackathons aren't really networking events.
The point I'm trying to make is, computing employers don't target solely Oxbridge, and you should never feel like that Oxbridge is where you go if you are the best. Glasgow has a thriving games industry. York's CS department actually has an IBM office in their building. And here in London, we rub shoulders with loads of startups and big companies - last term alone, I went to talks run by Google, Blackrock and Bloomberg, as well as visiting the offices of Facebook and King (the people behind Candy Crush). As long as you keep on making new things, as long as you study hard and learn the materials well, you'll have an education which is just as good as any other place, in my opinion. So, think hard on whether you would want to take a whole year off for a chance to study at Oxbridge.
That said, what other places did you apply to? I wish you the best of luck with your future