I'm going to post the response I received from the RWA below because it's really very helpful. Nice to know I have back up from her:
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'Well done with all of that.
We do hear of one or two school rabbits every year and it is just incredible to think that Head Teachers think that welfare has not moved on at all, and that this is still acceptable.
They do need to think about this more thoroughly, as you say, vaccinations, neutering, vet bills, do they have the budget for that, and the insurance or time for staff to take them to the vets? The risk of ill health when their diet is changing every weekend, and they are subjected to so much stress is high. Who is actually responsible for these rabbits? How are they going to control disease? What if they pick up VHD2 and then bring it back to the school for children to take home to their own pet rabbits? What are they going to do when they hit maturity, are entire, and they fight. Even more likely if they are in a horrible small hutch at weekends. They are not meeting any contemporary welfare standards, how can they justify that? What is it they are trying to get out of this for the children, because they are just setting a really poor example.
I would suggest I e-mail the Head, with your photo, and politely point out all of the above and try to establish what their logic was, and then in the first instance try to work with them on a suitable outcome for the rabbits. (This would involve the care taker being trained and checking on them every weekend, not them being farmed out in unsuitable housing and subjected to unnecessary stress, or someone else being trained and given keys to get in.) If we can not come to an agreement on that then we will suggest that we find a new home for them. If they will not work with us then we will have to go down the route of complaining to the Governors and the LA.
Are you happy with that suggestion?
What is they are feeding the rabbits now? Hopefully they have lots of hay and they are not on a muesli diet, but a good pellet like Burgess Excel? Are they kept inside or outside at school? Do you have a photo of their usual enclosure? I presume they are locked in the hutch over night?'