Surrey is one of the most professionalised pony counties in the country — the Surrey Hills and the belt around Guildford, Dorking and Godalming support a dense network of competition yards, showing producers and Pony Club branches, so it is genuinely realistic to find a pony with a proper record here. For a family wanting something already schooled, competed and polished, Surrey is a strong hunting ground.
That professionalism comes at London-commuter prices. Grazing is expensive and scarce, most ponies are on full livery rather than a private field, and you are often paying as much for the yard and the schooling behind a pony as for the animal itself. Ask directly what a pony has done competitively and where it has been produced — a genuine record from a known Surrey yard carries real weight, but be wary of vague claims that cannot be checked.