I know there were very few Fulmar crashes on UK soil so this helps.

There’s certainly very few listed in High Ground Wrecks (3rd Edition). As well as the Dartmoor one there’s another unidentified Fulmar near Westerdale in Caithness; another unidentified on the Mull of Kintyre and N4074 on Minera Mountain in North Wales. It’s mentioned here – http://wrecksiteuk.blogspot.com/2012/10/llangollen-revisit-beaufighter-ne203.html – that parts seen on a previous visit to the site had been removed by the time they re-visited it in 2012.

I find it quite surprising that 3 out of the 4 wrecks were unidentified despite 2 of them having exact dates when the crash happened.