As I have mentioned a few times, there is a group that has formed for users of the above schemes.

The link to their website is above.

The terms for joining are decided and agreed by the members there and I and my firm, whilst we have a contractual agreement and have had for a while, do not benefit from increased membership as we work on a fixed fee.

I would however encourage any looking for information, help, support, etc on these arrangements to at least have a look.