>> People will start asking where your funds are coming from.

>This is a weird statement.

Not in the UK. Here there's a legal obligation on the conveyancing practitioner - which you have to use - to confirm the source of funds for the purchase. They "will ask questions about your salary, request bank statements and ask you to give details of any family inheritances"[1].

[1] https://www.bannerjones.co.uk/your-property/services/buying/...