I went to The Open yesterday using the special 10 minute interval service from Liverpool. On arrival at Hoylake, I found a temporary buffer stop had been erected at the end of the West Kirby bound platform. A temporary platform-level walkway had also been built allowing step-free crossing between the two sides.
At the end of the day, I joined the queue at Hoylake station on the Liverpool platform and saw a class 777 approaching the one opposite. The Merseyrail staff had allowed a certain number of earlier passengers to cross and these filled the train with only a small number of people standing. However there were obviously problems with the doors with red strip lights persistently coming on and off in the back carriage. Eventually the unit was declared a failure and everybody was told to get off. The 777 departed ECS.
A 6-car 507 or 508 (who can tell the difference) then arrived and the staff allowed a large number of people, myself included, to cross over and join those from the failed train. This must have at least doubled the numbers on the platform. Most, if not all, got on but it was very crowded. The 6-car train promptly departed via the trailing crossover.