I have mixed feeling about the Sustrans issue.
On the one hand, I do make good use of the NCN routes near me. I commute 21 miles to Bristol mostly using NCN 3. Whenever I get the train I use the Strawberry Line to Yatton station. I ride with Bristol CTC a lot and we often encorporate long stretches of NCN 10 and NCN 26 into our rides. The Bristol-Bath railway path is a nice flat way to return from a hilly ride out in the Bath direction.
My parents did a very swlo LEJoG a few years ago using the Sustrans maps and leaflets as inspiration. They had a great time, and maybe wouldn't have done this ride without the info they had back then from Sustrans and trails like the Camelford one in Cornwall.
I also have a good friend who works for Sustrans in Bristol.
So basically, I am a Sustrans beneficiary.
The negatives though are that from what I gather much of the work that has been done around Bristol in the few years was actually funded by the huge cycling city grant, and almost all the maintenance of the existing routes is done by volunteers. Apparently this year Sustrans decided to make their staff canteen vegetarian only, which did not please the hungry carnivorous cyclists among them. What on earth has sustainable transport got to do with people's ethical dietary choices or preference
I am currently sitting on the fence. It's a bit spiky up here. Since I don't have a limitless quantity of £20's then I expect there are other causes more deserving of my donation this year.