Searching for an easy-ish trail above 30k In the UK

Hey all!

I would like to get tips from UK locals or people familiar with the land for a not-too-hard trail run between 30K and 50K in the summer.

I am a quite decent road runner and good in our local Dutch "trails" but I am afraid that real trails are still a bit out of my league.... so that I will steer clear for now from any race who's name includes the words "Dead","Hell","of Doom" or allusions to broken or mutilated body parts (Thus no "Hell's Bonebreaking Dead-Trail of Doom" this year!). LOL.

I am not interested in "Pink Butterfly's Easy-Peasy Carebare Run" either, just something that's humanly possible.

Thanks for the tips!!
 
You might want to post this in the UK Chapter, Enric, since no one here has answered.