It's supposed to be very good for Computer Science AFAIK.
As a general rule, most Universities don't care about GCSEs past the basic 6-7 A*-Cs (if that). They're usually much more concerned with A Level progress as it's a more immediate precursor, education wise.
The obvious exceptions to that rule (that I can think of) are certain courses (I'm aware of Medicine since that's my field, but I'm sure there are others) and Oxbridge, where it's generally good advice to show consistent potential, but even then, they're known for breaking that mould occasionally.