The mistake we made when we first got ours was planning too far in advance - booked sites in advance and then felt pressured to get there. Best to see what the site is like you are at and then decide whether you want to stay longer or shorter and then as Giok says ring up and enquire/book your next site just before you decide to move on. Usually possible. Just been to Cyrstal Palace for a few days and explored London. No 3 bus takes you to Picadilly Circus and beyond.