Theis still poorly.
Went to vets this morning and they decided to keep him in. Not quite dehydrated yet, skin and gums tests all okay, but vet thought he could well be on the way - so he's in, hopefully just for today, on a fluid drip.
He has had X-rays to rule out any potential stomach obstruction but nothing was found. Vet has now taken blood samples to test for pancreatitis with results back in hopefully later today. Possible course of antibiotics and anti sickness meds to follow. They'll phone to update me later today.
Thanks for all the good wishes thus far and I'll update later tonight when he's home.