yyy, i reserve a special hatred for estate agents. You have to remember they are working for the vendors and have no interest at all in being nice to you. They just want their money asap. A lot of them also seem to be a bit thick IME. In the past I have got so pissed off with them I just end up saying "please speak to my solicitor".
I'm in the same position. Searches done and our valuation done mortgage offer thru etc. estate agents keep giving me snotty phone calls asking for updates. It's in the hands of the solicitors! I really hate estate agents I always feel they are lying.