Just in addition - to be honest, I would advise anyone to avoid the graduate entry route AT ALL COSTS. Its ridiculously expensive, and considering you need the same A levels as a school leaver it makes SOOOOO much more sense to go and work harder at A levels, get a few years work experience, than waste it, spending money, getting into a degree, which, ultimately, is worth very little when you come to apply for vet. I WISH i had known this when i started my degree.
On your work experience - what you've got is great so far :-) You still need to do quite a bit more, but it looks like you're well covered in the small animals department. I would suggest doing 2+ weeks with a large animal vet, work on a dairy farm, a pig farm, poultry, go lambing, zoo, slaughter house, anything really...oh and horses! Try to cover all the bases, and have a minimum of 6 weeks behind you before applying. Given your circumsances, i think the best route would be to not go to university just yet. Go and sort out your A levels and work on some kickass work experience and you could apply next year with a good chance of getting in. You'd actually be out faster than if you did a degree first!!