The prices quoted are reasonable but it’s equally important to be certain that the specific Vet is experienced with treating Rabbits. Some Vets4Pets are great, others are awful.
This gives people an idea of how to ID a good Rabbit Vet
https://rabbitwelfare.co.uk/rabbit-welfare-association-fund/our-work/rabbit-friendly-vets/
With regards to medication. Some Vets might prescribe the Cat version of Meloxicam for analgesia. BUT as the Cat version is a weaker concentration than the usually prescribed dog version the Vet simply gives more in quantity of the Cat version to achieve the correct therapeutic dose
Just because the Cat version is prescribed we can’t assume it to be wrong as long as the quantity (in ml/kg) prescribed is greater than it would be were the dog version used.
Not all Vets, even Rabbit savvy ones, routinely give prokinetics post neutering. They determine whether or not to do so on a case by case basis as opposed to having a one size fits all approach.
Lord T, make sure you establish which Vet will be doing the surgery, have a read of the link I posted re identifying a good Rabbit Vet and then you can ask the specific Vet the relevant questions prior to signing the surgery consent form.