Finding a dog in the UK

Does anyone have any tips for finding a dog in the UK?

I would have liked to rehome a rescue dog but all the restrictions mean I can't. Leaving me the only option to buy. But online sites like pets4homes make me nervous. They have so few photos and short write ups with no punctuation and I just don't trust them. 😕

I just have no idea how to find a dog to add to our family so any advice welcome. I also can't afford to go full kennel club.