Deckertim of this parish and I rode the outbound leg this week. We rode from the Dartford Crossing, picked up the route in Loughton and then made our way to Edinburgh.
50 1/4 hours elapsed time. 460 miles.
Learning.
1. It's hard.
2. It's very hard.
3. The Fens is boring beyond compare and will be tough if there's a headwind. You will pray for a hill. A corner. Anything.
4. The hills proper start at 200 miles.
There are no insane hills, but fatigued legs make even the normally easiest a challenge towards the end of a leg.
5. Riding the first 300 miles in one hit is not a good plan.
6. Eat proper food whenever you can - sandwiches and cereal bars is not good enough.
7. If you lose your appetite, force it down. Little and often. Don't forget this.
(I bonked about 4 miles from the end and it wasn't until later that I realised how little I'd eaten during the preceding 16 hours)
8. Be sure you are comfortable on your bike, especially the saddle. A Saturday club run is not the same as 48 hours solid.
9. They do a good roast dinner at the Gretna Green visitor centre. That's the only reason to stop there. And don't expect any veg!
9. Don't do it if you expect to enjoy it.
I'm sure once my body and mind have healed I'll be able to provide some more considered advice!
I'm now heading to the station for a well deserved 5 hour sit down journey back to London.
Later.
EDIT: corrected the distance to miles, not km)