Are we talking monopoly boards here, because Liverpool St ain't anywhere near Marylebone...
Liverpool St is a stone's throw from Fenchurch, yes, but Marylebone is quite a bit further away - you'll pass Kings Cross, St Pancras and Euston before you get to Marylebone...
LJ you're welcome to a lift on any occasion that I'm going, and I'll even pick you up from Liverpool St, but you'll see how big my boot is on the 15th so you may want to get someone with more luggage space once you start collecting more gear (and especially once you get that rolling gear sack!)