UKH

I’m looking for some inspiration for the next few months. Long one day runs or rides in the Southern part of England or in Wales. As an example of some things I’ve done before: Welsh 3000s, South Downs way in a day MTB, a couple of Endurance Life coastal path marathons. 
Thanks. Look forward to hearing your ideas. 
 

https://fastestknowntime.com/

Check out your local area and go after one of these, or devise your own - then you'll definitely have the FKT, or OKT  

Dartmoor crossing (okehampton-ivybridge)?

Paddy Buckley Round? That's a nice long day out!

Dartmoor North to South is great. Although you'll need a bit of transport logistics to get dropped off and picked up at the end. 

The dartmoor 600's is also good, and circular. Although probably wait for it to dry out a bit first. 

Something long on the coast path?