My tenant had to get an emergency locksmith in. She paid the locksmith herself and I reimbursed her later. However, she forgot to get a receipt for the work done. I asked her to sign a receipt saying that the work was carried out and that I paid her. Will this do from a Revenue point of view? If an audit is carried out, how much checking do they do of receipts, e.g. do they verify with a tradesperson that the work was actually carried out?