hogfather said:
Employers, broadly speaking, know which universities are good for the types of degrees relevant to the jobs they offer - so if kingston is known to be an above average institution for CS, then you'll have a good chance of getting an interview.
Maybe that's true in larger companies, but I doubt the typical small company will have a clue. If you take me as an example (I've looked through applicant CVs and interviewed them on occasion), I have a vague idea what the top 4-5 universities were for maths 20 years ago when I was applying, and an even vaguer idea about the better universities for CompSci. Not only do I not really have a clue about the other universities, but even what I do "know" is woefully out of date.
So when I've looked at graduates' CVs, I've paid a fair amount of attention to the A-levels, because at least I have a vague idea what they mean. And let's be honest, to a large extent I'm going to think "AAAA at A-level, went to Hogwarts University... Well, I've never heard of Hogwarts, but I guess it must have pretty high standards then!"
Next, I also look to see what they say they did in their degree. In general we're looking at CS graduates, and I'll pay particular attention to their projects. I'd say specific evidence of what interests you or you were really good at is particularly important to me. In other words, if you say "my best course was the one we did on AI", that's just sounds like waffle; it sounds much better to say "my best course was on AI. I wrote a program to play Othello and entered it in the Computer Olympiad". Even if your program came last, at least I know I'm dealing with someone who can actually complete projects, as opposed to just being a bluffer full of hot air.
On that note, my advice to someone like triggerthat is: find an area of the course you're interested in, preferably with a lecturer you get on with (and in my experience, lecturers generally get on well with students who are genuinely keen on the subject), and basically make yourself an impressive project out of it, even if that means doing something completely outside the course. The advantage of the smaller places is their research arm is usually small enough that an undergraduate can probably get involved. You might even get your name on a paper or two. Which would impress me a lot more than a degree from Oxbridge.