I have to point out that Mrs Norm was on their tails the whole time, running stuff between offices rather than entrusting it to the DX system, for instance.
We also bought from the builders, who were very keen to get the property off their books for their year end, so the pressure was on the solicitors from both parties.
However, that was not only buying the new house but selling the old, so it was pretty impressive.
Best advice, whoever you use, IMO, is to get to know the solicitor as much as possible. I have taken cups of Starbucks in to my employment law solicitor (she likes black Americano) so I'm "that coffee chap", rather than just a file number.