loulabell: it was great to go down the steps from the field into the plantation and turn DOWNHILL rather than UPHILL - I'm sure you remember that uphill slog to the Botley Hill aid station! Of course, I had a fair uphill section on the way back and was very pleased to reach the steps and be back on a level for a bit before the steep climb where the two routes diverge again at the bench (NDW continues along the hill). I meant to stop and take a photo of the Greenwich Meridian plaque on the way back, but failed to see it (having noticed it easily on the way out). Oh well, I'll just have to run it again sometime! 
I met another runner at the steps. He was wondering which way to go (obviously failing to see the large signposts at the bottom of the steps) so I asked him which route he was following "North Downs Way" he said. "Uphill," said I. "Up for North Downs Way, down for Vanguard Way." He still looked hesitant. "Trust me on this" I said (thinking: I've run this section of NDW THREE TIMES, I do know the way, really)... and he set off again.
As I've written previously, I did my NDW recces in wet & muddy conditions, so for me it was a nice change when the ground was hard and dry for the race. Interesting how slippery the packed chalk was on that field section, from the rain the previous night.
I must work out how far it is from Lloyd Park (Croydon) along the Vanguard Way and then up to Knockholt Pound via NDW. That could make a nice run. Wonder if there's any off-road route back to Lloyd Park. Hmm...