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ExTra
This is a decent guide
https://www.samconveyancing.co.uk/news/conveyancing/how-to-prove-source-of-funds-1614
For the lump sum you'd need an explanation of where it came from, either an illustration of small amounts constantly coming in to show savings or the detail of the gift (and how that was funded) or whatever, even if it has been sat in your account for a while.
Conveyancing solicitor is normally the one (although other solicitors and accountants will be aware of the rules). Banks may not be aware of the detail (at least the person you deal with).