You could do with going on the Tortoise Trust site and/or The Tortoise Protection group.... My links are all over the place at the minute so you would be best of googling them! Both of them (I think) have breeders lists but also rehome torts.

Please don't go down the pet shop/garden centre/reptile shop route.... From past experience they don't know what they are talking about where torts are concerned.

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Galaxybears Newfoundlands, GSD's and Cocker Spaniels