I did it (well half of it). It was without doubt the most vile, unpleasant and hard thing I've done for a while.
It's rained a lot the past few days - the otherwise lovely tarmacced paths were wet, slippery and covered in mud. The less well maintained wooded paths were like quagmires. Roads were shut, the signs made no sense, and I ploughed my bike through 'a puddle' in which hid a large rock, this ended up with me on the floor in a pile of mud with a bent front wheel.
So I didn't do Barnstaple - Plymouth as planned, I did Barnstaple - Hatherleigh with a small detour due to road closures.
I came home on the bus which took 3 hours - this irritated me a lot, because I reckon I only needed 4-5 more hours cycling to get back under my own steam.. and because you can't take bikes on stupid buses I have to go back in the car and collect it tomorrow and take it to the Bike Dr.
Would I do it again - OMG yeah
I loved it. It will not beat me... I will be back (when it's less dangerous, or I will be on a mountain bike) and I will conquer it...!!
https://www.strava.com/activities/377847938/overview
Slow... but still not too bad for a beginner!!
I will stop hijacking your thread now
@Cannondale Lady - but I thought I'd let you know I was back, muddy, but safe and happy