I am needing to travel into central London for an appointment but have a slight problem. Two of us on the train is £120 for 70 miles each way during the week, the bus is cheaper but takes a fairly long time and not often. None of my cars or bikes are allowed into the LEZ so they are out, but my motorhome is?????? being Euro6.. however the very thought. of trying to park make me ill.. What I propose is going up and staying somewhere overnight but knowing where is the problem where it would be safe. There is a site at Crystal Palace but it is miles away from regents park area. Does anybody have an idea which has good transport links to the centre?