Forget solicitors! There's a local probate court in Bodmin, with interviews taking place in Truro
You only need go there once to swear under oath. They then send you the probate certificates in the post. You send each of the building societies a copy, and your sister's accounts will then be put in your name. It's wise to request a couple of extra copies in case anyone else needs to see it, but they'll advise you about that during the probate interview. Don't forget, they're used to dealing with bereavement. They don't expect you to be familiar with the process, or to be in any fit state to deal with it.
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