Two points need to be made, I think.
(1) GRO doesn't run the wills service. Complaints to GRO will only frustrate you, and bewilder them.
(2) I have every sympathy for the Probate Search staff - those who always used to have a manageable workload and are now swamped with extra work and likely no extra staff. I haven't worked there myself, but have been put in a similar position because of 'bright ideas' from management who have no idea of what their staff actually do. And remember, those people who are expected to 'keep calm and carry on' won't have the authority to add helpful messages to the website.
DON'T COMPLAIN! Please let these busy people get on with their jobs without having to stop and apologise every few minutes. Use some common sense. The backlog will be cleared, they always are. (I speak from experience.)
Part of the problem is that we've been conditioned to expect instant results, but we're not talking about Amazon here.
Carol