Usually works out to be around £75ish including vet's call out. Ideally you should allow them to stay quiet for the rest of the day and just chill out but nowadays I think people tend to work them straight away more than they used to.
Whether or not you should ride or exercise them after vacs varies which vet you speak to! I would suggest that ou avoid working them after the vac and make sure they are not worked for a few hours before hand.
Its £28 i think for my vaccinations. I ride my horse to the vets and back to save the call out fee. I stick to walk, but the vets have never had a problem with me doing this.