I like your thinking Liz and I can't say I'm not guilty of regaining myself, I just can't imagine going through all this VLCD stuff and then undoing it all, I lost my original 11.5 stone just counting calories, it was a longer term approach and I kept it off for more than 5 years doing exactly what you're thinking about, very good on the week and then relax a bit at the weekend but not going crazy, I basically did SW green days all week and then sinned like hell on Friday!! That kept me stable at 13.8 for a long time.
I'm not too worried about going back to old eating habits as I think I never really regained the bad ones that I had, I just ate too much pizza and relaxed a bit too much at the weekend, probably gaining just about a pound a month or so until it was 3 stone!!
Definitely keep up the weigh ins, I know if I'm not on the scales its because I'm in that river in Egypt!!