Apparently the Wrexham & Shropshire Railway is soon to open services from London (Marylebone) to Wrexham.
"Wouldn't it be nice if" - they added an overnight service to/from London and extended it to Birkenhead. Mind you, I've no idea whether their trains are capable of traveling to the Wirral?
That the route is slower than the mainline would be an advantage for overnight trains. Right now it is very difficult for anyone who wants to stay in London much later than about 8pm and then head back to Merseyside without the inconvenience (and considerable expense) of staying in London overnight. Something leaving London a little after midnight and arriving in Birkenhead around 7am would be ideal for clubbers theatre-goers and the like.
They invite feedback on their website at:-
It would be great if some Yoliverpoolers would give them feedback , especially if you think you just might take advantage of overnight trains if there were any.