They did actually get wormed on the Friday but sounds as if they are riddled
It may be worth mentioning when they go in that they have had a wormer already, I use Milbemax. I know when I've had feral kittens in and they've coughed up worms, and even after worming, they've hacked them up again a week later
The owner did say she'd wormed them but she'd used pet shop wormer which I made her throw out
Fingers crossed that's all it is, xxx