Hello all,

It would be great if anybody could shed some light on my problem.

Roughly two years ago my girl friends parents moved into a new house, the previous owners of the house had moved aboard, but left their cat behind so my girl friends mum started to look after him (he was skinny and unable to jump very well).
The adopted cat didn't get along with cat they already owned, they started to fight and spray on the furniture etc, so she suggested that I adopt the cat.
So I took him in, and went to the vets got him his jabs and a check over (he had muscle wastage on his back leg).
The cat settled in put on weight begins to get stronger (climb trees etc). A year on I took him to get his jabs again and thought I would get him chipped.
Here's the problem when the vet scanned him he already had a chip from the previous owners that left him behind when they moved abroad, who I have heard have now moved back to England again (The neighbors of the original house told my girl friends mum).
I was told by the vet I would have to right a letter to get the information changed on the chip. I am worried that they will contact the previous owners that left and neglected him and they will want to claim him back. I've had him for 1 year and 7 months, and he is now strong healthy and happy.
Has anybody had any similar experiences and could offer any advise, thanks for the help