Carl, some great running from you. Regarding the race pace, I think it is quite hard to replicate race conditions in training, so try not to worry about finding that 14-miler hard. You know you've done the training and will be tapering soon, and if it all comes together on the day I'm sure you're going to do great. For me (and I think probably most people) something happens at a race and on the right day everything clicks into place. I know this because there is a measured 5K course that I run on in training, which is also used as a time trial by my club. When I run it by myself I'm lucky if I get within 30-secs of what I run it with the club. Strange but true.
It is for the above reason that I've got rid of my number for this weekend's 20 mile race. Physically, I probably could trot around and not do too much damage, but I question whether I could stick to the LSR pace in a race. If I ended up racing it (or trying to race it), I think that would cause me problems.