In message , Annabel Smyth
writes

You ought still to be able to get the Tube (it runs, I think, until
11.00 pm) to Tottenham Hale and then the Stansted Express on from there.
It will be a bit of a rush - if your coach is delayed for any reason,
you may miss the last Express, which leaves Liverpool Street at 23.59.

According to both National Rail Enquiries and the Stansted Express
website, the last Stansted Express leaves Liverpool Street at 23.30 and
calls at Tottenham Hale at 23.41 - that's gonna be one helluva rush even
if arriving at Victoria coach station on time at 23:00 !!

--
Paul Terry