From what I understand now (having read a bit more) the solicitors need to cover their own backs because they get criminal charges if they are seen to aid in money laundering (even by negligence). So they will play detective to be safe their clients will not drag them down. The building society will have their own checks in place. I do not think the lawyers are acting on behalf of someone else (eg the Inland revenue or the land registry), it's just for them.
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