Hmm. This Stansted thingy, unfortunately I will be ensconced in a Norfolk lovenest with The Present Mrs Mmmmartin, but after much faffing with the interwebs, I realise I can do 100k to the start of these ACME Winter Series, and the Tilbury passenger ferry starts at 5.40am on a Saturday.
Afterwards I would probably need to ride home at once - but will certainly fall prey to temptation and drink beer with Jiberjaber, necessitating use of the railway.
I'll look at the others in the series.