i wouldn't under any circumstances let your home-help have your key. my ex cleaner (of 5 years) said she'd 'lost' my front door key when i asked for it back when our business relationship ended. it also had our alarm key on the key ring. after numerous letters to her (she wouldn't answer her phone), we finally just changed the lock and have since had a key-less alarm system fitted. my advice is definately don't do it, you have to be very, very cautious who you lend/give a key to.