I've done it. Long time ago now, and there's no way I'm thinking of having another bash. Secret is to get some good pacers. You really need to be in the fell running scene. Go to a few races. Talk to lads who finish round about where you do. When they start talking about having a go then volunteer for pacemaking duties. Don't ask for petrol money or expenses or you'll soon be on your own. Once you've helped a few guys then you have favours to call on. Recce it well beforehand, every section, especially the night time ones and the last one. You'll be knackered then and need to be able to navigate on auto pilot.
Do lots of training. Miles in the bank are invaluable, in all weathers. You've got to know a lot about yourself. There will be times when you are so knackered that you are running on memory, so make sure there's something to remember!
The route has lots of short cuts nowadays. There's a quick way up Fairfield, a short cut up High Raise, a superb quick route up Bowfell and an excellent cheeky bit off Robinson. Make sure you know where the water is, especially on the Scafells. There is little between Calf Cove and Wasdale.
Car support is also crucial. You need someone reliable who you know will always be waiting for you. They should also be able to make you eat something, even though you say otherwise. Don't rely on your parents/brother and sister. Get a wisened old hand who knows the ropes.
Most important of all make sure your pacers know that they are in charge of getting you round. They carry ALL your food and gear. They bully you, lie to you, praise you and ignore you all at the same time.
If you have a good run it's a magical feeling. If you fail you are as low as can be.
I heard a rumour that the record holder – a certain Billy Bland of Fred Whitton fame – is thinking of having another go, just for old times sake. After he set his record, back in the mid 1980's he went back and walked the route, still within the time limit. It can be done. Don't try and break the record – no-one has been near it, and it will be a major shock if anyone betters Billy's time.