For those who are wondering about where they will go for signalling school. Just bear in mind that the company have suffered a training back log during the pandemic, and are also starting with this large recruitment drive to try and cut down on vacancies that aren't filled, as well as recruit people to fill new positions created to bring down the average working week of the grade as part of the fatigue management initiative.
Courses are being run as and when they can be, wherever a suitable location is available. It's no longer just the "big four" of York, Westwood (Coventry), Basingstoke and Perth. New locations have opened all across the country, and are still opening across the country (I read just a couple of days ago that space is available at The Quadrant in Milton Keynes), and you may find things are changed at the last minute.
Basically what I'm trying to say is, don't get too hung up about where you go. Put your life on hold for that 10 - 12 weeks, put the graft in, enjoy it, and take it as a bonus if you end up somewhere nice like York.