The promo to those who have run before is pretty good - I get a few emails from SI entries a year saying entries are open, remember this, last chance.
As a Fell Runner who orienteers the LDMT is ideal for me but I've only managed one (I was entered for the called-off event in 2013). The last 2 years there seem to have been clashes (although this years was a Pyrenean holiday).
One issues is a bit of calendar congestion at that time - normally the last English Champs race will be in early/mid September. Then there's 3 Shires, Scafell, Yorkshireman off-road marathons etc. around that time. It's also not far out from relay season so a big day out may put a few off.