Is it normal to give all your house keys (well, front door) to an agent so they can allow viewings when you are not there?
An elderly relative of mine has done this recently and says it's normal now (Covid) for vendors to be out of the property and agents to let themselves in for unaccompanied viewings.
I feel a bit worried as they live on their own (and now someone had their keys) and I also read that it can invalidate house insurance if someone else has your keys.