Thanks for all the replies people, much appreciated.
The split I'm intending to do will mean it's done on 2 separate days, as opposed to a hour's break (or so) between the NAV and GFT. Part 1 is booked in for this Thursday evening, part 2 on Saturday or Sunday, weather dependent.
Modelman - I'm in a PA28 so endurance wouldn't be an issue. I agree with you though: after all this hard graft I don't want to blow it now!
Thanks again
Tim