This will be of no help to you whatsoever, but when I took my cat to the vets last week, there was a woman in there with four adorable tiny kittens in a cage. I think they were Bengals, three were grey tabby and one white. They were all mewing and climbing all over each other. I so wanted the white one!
Is it definitely a kitten you want or would you consider something slightly older? It might be best if you have a look at the website yourself, there are loads on there!
http://www.purrsinourhearts.co.uk/index.php/board,61.0.html
Not from Battersea you can't. Not unless you have no children, a palatial mansion including a specific cat chill out area, 7 acres of land and can feed them fresh salmon every day or something.
Them Battersea cats like posh, apparently.