The advice from everyone was to rest, eat loads of good carbs and drink loads of water.
So:
2 bowls of muesli with soy milk
1 granola bar
2 bananas
1 small orange
A few prunes
2 wholemeal toast with peanut butter
2 wholemeal toast with 2 fried eggs
1 chicken breast with wholewheat pasta and a head of broccoli
Loads of water
That should do it!

It was very frustrating not being able to do a training ride in the sunshine and in the end I decided to take a very slow trundle down to Halfords in town. I kept in the small gears and took it easy. I was very worried to find that my left knee was aching - maybe a result of the hill climbing yesterday?
I saw Adam, Nic and Nat - the lads at Halfords - and they told me they'd enjoyed checking out the Coed Y Brenin video on our website. They took a look at my front brake, changed the pads [for free!] and cleaned the front disc. Good blokes, hopefully I'll get to ride with them soon.
At home I contemplated doing a spot of weight lifting but decided not to risk it. I did some vacuuming instead.
Well, there's nothing more to be done. I know my training was not as good as it should have been but there's no use worrying about it now. I'm pleased with the amount of miles I've put in, but I'm disappointed with my eating habits over the last 2 months - I really could have been so much more sensible with my diet. I've lost a few pounds but nothing significant. Hopefully, the miles on the bike will have made me mentally stronger if nothing else.
My personal plan for tomorrow is to go full tilt out of the blocks in order to get to the descents as quickly as possible, get my breath back, lay off the brakes, and then hit the climbs full-on once again. Repeat until finished...
Good luck to Dan, Lloyd, Matt, Nick, Pete, Nathan and Dave. AMBS for the win!