Updating this as I've now ridden this bridleway!

Well I think my fell-running past may have led to me underestimating this slightly. The first climb caught me out and I walked for a bit, then got back on and made it up the rest of the hill The shingle covering didn't cover all the path and my tyre tread filled up with mud. I had to stop to take a twig out of a mudguard. The unmade section was rutted agricultural track, I rode down the top of one of the bumps, if that makes sense. The last section was a one-lane tarmaced hill with passing places that services some local allotments. I went down it feathering my brakes all the way, can't believe how fast it felt! I did a mile or so on the MUP on the other side of the trail then came back. I had to give up on the tarmaced hill but did manage the rest without stopping. There were a few bends that I hadn't remembered too I had such a blast though, it really took me back to my fell-running days. I'm now really thinking that rather than trying to find routes to the shops that I would be better served exploring the wealth of off-road opportunities that are virtually on my doorstep.

Thank you so much for all the advice, it was all much appreciated and I'll be re-reading this before I do the path again, hopefully on Friday or Tuesday.