I'm from the UK too, and i know a few breeders do put their stock on preloved and gumtree. And also £250 is a reasonably good price for a male pied, as I've seen females go for around £350. However, I wouldn't trust doing a payment plan on those sites as lots of things can go wrong.
I'd join some of the UK sale groups on facebook, especially the IHS Doncaster sales group, as many of the more reputable breeders put their babies on there, and you can pick it up on one of the shows if you wanted, or get it before hand by pickup or courier.
