LOL....never used to be an issue here years back. Just seems a body or club have added it as part of a route and publicised it.
Its possible. There are a lot of pressures on off-road access here in the UK. Powered access was probably reduced by some >60% in one fell swoop, when NERC Act came in. Ramblers made sure of that. The sad thing, from my point of view anyway, is that most all of the objections leveled at use, certainly by powered 2-wheelers, is unfounded. Well, that is until you factor in that usage increases on what's left, and results in 'bikers' then chosing to ride illegally; although the muppets who do it, probably were always going to do it !
As for a club using it, you might be right. Id contact the local TRF group and say something. If it's them, they should be approachable, and flexible enough to be a little more considerate. Large groups are very noisey. Like Phil says, riding alone isnt generally recommended by clubs; but larger groups is/should be. As too speeds and noise levels...The TRF arent beyond reproach, and I see huge groups riding out under the banner- but they are supposed to represent those with a responsible take on the conservation of green lanes, and ignoring you isnt in their best interests...
The TET-Trans Europe Trail, was uplaoded online a few years back. There was objection from every quarter. That bikers would descend on the quiet lives of peasants and hobos alike, throughout the whle EU block ( you can ride from Norway to Morrocco off-road essentially- or split and do Italy ) This hasnt really happened. I guess I think there might be a link between the two situations but whatever. If its legal, it's legal. But anti-social inconsiderate b0ll0x is just that !
Depends how much time and effort you are happy to sink into sating your umbrage in search of satisfaction. It would probably be pretty sol destroying to chase the scotes, one number plate at a time !!?