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Engage the solicitor then go into details.
I wouldn’t. Solicitors have varying attitudes on how far they want to trace the money. Appointing someone then finding out you can’t satisfy them is a waste of time.
A Chinese friend got rejected by every firm in our town and ended up with an expensive London firm specialising in Chinese relocations as they were the only ones prepared to put their name to the origins of the money being legit. It was legit.
You haven't moved house in a while, have you? If you are using any substantial amount of savings then money laundering regulations require your solicitor to ensure that the funds have come from a legitimate source.