Ah, I was glad to see this thread, having just walked in the office from a trip to Durham's passport & identity offices.
Did the check and send thing in time for a trip to the US tomorrow, phoned yesterday to see where it was – still awaiting processing – so had to pay for them to go and get it by courier and 'upgrade' to fast-track service. Then, as it missed the post, I had a little jaunt from Leeds to Durham this morning. Total cost of all that faff, plus a couple of pastries to make me feel better, just over £200! Luckily my ESTA went through in a couple of seconds – that was the next worry!