In reply to Somerset swede basher:
Mortimer road seems to always have a tail wind as you get towards the A57 but it's an ok ride in both directions.
As for the off road section, not many people ride it because it's incredibly dull between the two dead end bridleways, a lot of it is flagged so like riding over massive cobblestones.
Depending on what you're after there's much more interesting riding around there but it's not the easiest to make into a convenient loop.