Sonic has to go to the vet again to get one of his claws sorted out - he's getting on a bit now, has arthritis, and doesn't wear them down or properly pull off the dead outer layers by running around/climbing/scratching like a younger cat would, and occasionally gets a "thick claw" thing going on, which I can't cut cos of the arthritis in my hands.
Our vet surgery does a claw trim and general wellbeing/advice/grooming service with a veterinary nurse for £10.50, which I make use of in these situations.