Thanks for the replies.
How can anyone official really notice in the big bad world of banking and tax scheme of things if she draws out a couple of grand in cash 13 times every other week/month or so from Bank A?
Then Mr Smith (different surname of course) pays the odd thousand pound in cash to Building Society B here and there over the same period of time?
Mr and Mrs Smith, have recently paid in 2 large lump sums without anyone asking where the money came from, so how can the above 2 scenarios be linked together?