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The only Wiltshire apple variety I've seen available commercially is 'Roundway Magnum Bonum', which hails from near Devizes. Adams Apples in Devon usually has it – I've found him to be a very good supplier.
Choir Boy and Bedwyn Beauty are others.
Beauty of Bath is also very local as it hails from the Wiltshire side of Bath, so worth considering as an early apple.
It's worth contacting Brogdale to see if they can help further – they also provide a grafting service from trees in their collection.
Just remembered – Marlborough have a community orchard project aiming to have as many Wiltshire varieties as possible. Worth contacting them?