Many of the comments seem pretty balanced and reasonable.
Read that article with interest after reading this post on the CTC the other day -
I am the chair of a Local Access Forum and a member of another LAF, and it has often struck me that neither Forum has ever had any contact from CTC with regard to off-road access and rights of way. The only time I wrote to CTC about an off-road issue, I received no reply. I assumed at the time that this was because what little resource the CTC had was devoted towards specific projects like supporting trail-building.
As a result what few improvements you will ever see in access and rights of way are down to LAFs, local authorities and the British Horse Society. No cycling organisation gets involved, even though many thousands of CTC's membership must be active mountain bikers, as well as road users.
My advice to anybody who wants to see off-road trails improved in their area would be to join the British Horse Society and not the CTC, even if you don't own a horse. They do far more for off-road cyclists than the CTC does, and might do even more if you campaigned in your area for a particular trail to be improved, or a footpath to be upgraded to a bridleway. By comparison, the CTC doesn't appear to be interested.
Don't be too quick to distance yourself from horse riders. They may trash trails in winter from our POV but there's more value in working with them than against - ime I'd say they're all quite friendly towards us. MTB has no UK-wide voice, apart from local groups where it's been forced by access problems. Until we all spend as much time on creating one as we do on here, it won't have.