Hopefully a simple one (and if I knew where to access the routing guide online, I'd find it for myself!). I'm flying into Gatwick tomorrow and have all day to waste before an evening appointment in London. I fancy going to the Isle of Wight mostly just to play on the old underground trains and the hovercraft. If I buy a London Terminals to Shanklin day return, is that valid out on the southern route via Gatwick and back to Waterloo? Is there any day rover which would make it cheaper? Thanks in advance.