Hi,
Amy,
I think that you will have a struggle to get into a UK veterinary school with only a C in double science. As far as I know most of them look for A or A* grades in Chemistry and Biology, and possibly a B in Physics or maths.
What you need to do is to write to the Admissions Secretary at the vet school of your choice and ask them directly.
I assume that you know where the 6 UK veterinary schools are located?
W