I would use the vets at Market Raisen, Rase Veterinary Centre Vets Tel: 01673 842448
but not sure about farriers and dentists. I only ride a friends horses in Scunthorpe!!
I can vouch for the vets at Maket raisen. They've done a bang up job on getting my yearling's leg fixed. I'm sure they could advise you on a farrier and a dentist.
I live 20 mins south of Scunthorpe and use Rase vets and also minster vets. Pm me for a great farrier number, does some top horses and racing school. Dentist numbers on the board in bells in Brigg