I know them. They neuter, vaccinate and do home checks. I believe they also do bonding for adoptees.
I fostered a rabbit for a group called Bunny Angels (who help get rabbits out of bad situations then find places in reputable rescues), and he, Angelo, went to Yorkshire Rabbit Retreat, which I was really pleased about as I would trust them to only let him go to a good home. As a very skittish bun, he was there for a year but recently got adopted.