I did Ennerdale a few years back. I arrived at CP 3 - the Tarn - inside the cut-off but severely blistering and informed the marshalls that I was DNFing and would make my way down to the what I think is Black Sail Hut and back down the road to the Finish.
It took me 2.5 hours to get back - it was an unbelievably long way.
I did stop and wash my feet, changed my socks and jogged it, but I also made the error of crossing the lake at he top and running down the South edge, thinking it would be quicker, but with blistered feet I may as well have been going over Kirk Fell
I'm only really posting this because I've done quite a bit of racing and see myself as ticking the ER box, but that was another level for me.
You are so remote at CP3 that you almost may as well complete the race.
the weather was great, I had a smashing day out and the 2 guys from CLEM that I drove up with completed well. I had no one to blame but me.