It's an event where plenty of experience helps. You have to just keep on giving it a go every year. 3-4 and 4-5 are classic Mountain trial route choice legs. Interesting that 4 to 5 Jonny had the fastest time doing the road run bit which can not of been that nice. The year I did well in 2005 was similar I ran all the way up out of the Duddon valley to the three shires stone on the road.
Rhys always says straight is great and take on the climb is best for the MT and I would tend to agree with him. Knowing race lines and the recce of random bits of the lakes you have done would also help. Knott Rigg is one of the lesser visited areas you have to learn is crap (which I have done).
I don't necessarily agree with lots of specific MT experience being required - MM and Classic races suffice. My first MT was underplanned (3h winning time). 2nd cancelled outright. 3rd cancelled when leading (the same person had something to do with 1 and 3) 4th won. Yes this is just a chance for me to say I've won 1.66 LDMT to make me feel good as feeling very beaten up by the DB!
Cheers. There was definitely a lot of choice as evidenced by the variety of options on routegadget, which makes for a good challenge, but minimises the chance that you're going to be happy about your run afterwards.