A quick search came up with External Link/Members Only or External Link/Members Only , she's 4'9. Can't vouch for her at all, looks like she is based in Addlestone, she certainly meets your height requirements. She's 24 so definitely not a granny!
Difficult without knowing a bit more about what you're seeking but IF you like Thai girls, most of them will be 5'3" or under and there are plenty of them around.