In reply to Dark-Cloud:
Ended up in Ambleside on the Friday buying a new waterproof after checking the updated forecast. Wasn't sure a Rab Spark would be comfortable with the forecast weather.
In the end, didn't need it. Unfortunately, DNF'd at Buttermere after my mate had a couple of falls coming over Black Sail. He was completely out of energy (unlike him so early in an event - poss a combination of the heat and inability to properly fuel and hydrate) and staying together meant we timed out at Buttermere.
Shame, because I still felt really good and missed the extra weather challenge on the Saturday!
Must make sure I get a LL100 entry again next year.