NB - the below is for guidance only and shouldn't be relied on!
OK, not been around the forums for a while as things are a bit hectic but AFAIK there are 2 regions, East and West. Now not 100% sure, but think West covers Liverpool, Wigan, Man Picc, Buxton, Blackpool, East being Hull, Huddersfield, Sheffield, Leeds, Doncaster etc.
Internal staff already earning more than the training rate retain their current rate of pay e.g. guards are paid in the mid £20,000s, people off the street somewhere around £19,000.
It IS possible to swap shifts e.g. if 1 person prefers mornings and 1 prefers afters then they can pretty much do a permanent swap, but this depends on how many people are in the "link". i.e. an odd number would make it difficult, an even number should be fairly easy.
Morning starts within the same week could range from 4am to 8am depending on depot so a 4am start on Monday, 6 am on Tuesday, 8am on Wednesday, 5am on Thursday ... (you get the idea) and this can mess your body clock up a little, but there is 12 hours between swipe off and swipe on.
This time last year there were reportedly around 650 applicants per vacancy (word of mouth from a member of office staff) so competition is fierce.
Best of luck to you all!