Cambridge is very different from the other vet schools in that they lean heavily on the academic side of things. This is reflected by the fact that they don't seem to care too much about work experience! However, in reality they do - I certainly got asked about it in my interviews. From a personal perspective, entering vet school with little/no WE is not a particularly wise thing to do - the amount of WE you have done seems to be approaching that which is acceptable for most schools. Try to aim for 10 weeks in total (Liverpool req's) and you can't go far wrong!
Now if I may veer briefly away from your post... try not to pick a favourite vet school!!! Of course, when applying we all do have our 'one that I'd pick if I were insanely lucky enough to get more than one offer' but in reality the vet schools pick you, not the other way around. Picking a favourite and focusing your application solely in that direction can be dangerous as you can easily end up with no offers at all. This is the mistake I made first time around; I really wanted to go to Cambridge (pure ego I'm afraid...) and spent loads of time picking up on the particular Cambridge style and basically ignored my other applications. What happened? 4 rejections and a realisation that actually Liverpool was the place for me... I only realised this at interview, as I hadn't bothered going to the Open Day as I was so Cambridge-focused.
Anyway, you sound as if you do quite a lot of extra-curic's, actually. Have you ever played any instruments/sports?