Tracing Equines

I am looking to track the old owners of my favourate pony from a riding school that was sadly put to sleep 2 months ago. He was baught in about 2010 from south england and advertised on horse and hound, baught by Gertrude stables in Nottinghamshire and i would love to have any information and photos from his old owners, he was a great horse with an amazing personality it would mean alot to me thanks in advance