OK - success at 1am exactly -tried at 11pm and 12.15am just in case.
Super priority option came up - selected and paid that and then we were directed to the booking site for appointment options.
We selected the basic option one (of four options available, but business option was for groups only and VIP option was over £2000 extra! ) The basic option could also include add on extras like document scanning when booking.
We managed to get a reasonably nearby location 43 miles away. Each venue had information about whether extras were available like 'express'.
The soonest appointment available at the venue we selected was in 10 days at 7.30am, after that there were quite a few the following week, including some free ones. There were a lot of free ones on a Saturday in four weeks (that Beth can't make). We selected a Friday free one, but it became unavailable within the few minutes it took to view and select it.
We settled on one in three and a half weeks that was £81 for express appointment and paid extra £54 for scanning just for peace of mind that it will all be uploaded correctly.
The only tip I would pass forward, as well as confirming that the magic 1am portal works, is that there are quite a lot of options to be ready to choose quickly - distance, day of week, time of day (I was not expecting we would have much choice), standard or express, document scanning or document checking service. The free slots can go fast.
Best wishes,
Emily