Now, nearly six months later, I am delighted to note that there has been a surprise happy ending to this story. The following text is reproduced from the facebook page of the Heath Veterinary Clinic in Hurstpierpoint (some distance from Leighton Buzzard!):
"Jasper is a Whippet who was brought into our Hurstpierpoint Clinic on Thursday 12th March after he had been found wandering nearby by a member of the public.
Rhian, one of our vets, checked him over and scanned him for a microchip and it was discovered that he was registered to an address in Leighton Buzzard, Bedfordshire and had been reported missing/stolen in September 2014. In the meantime Jasper had been sold to a woman who had looked after him for the last 3 months."
For those of you that use facebook, there is a page about Jasper here, including a video of the happy dog being reunited with his owners.
My reason for posting - apart from it generally being a nice story - is to reinforce the importance of having your cats and dogs microchipped. Jasper's microchip is the reason he was able to be reunited with his rightful owners.