I am very sorry for the difficulties everyone has experienced in getting access for themselves (or their children) to riding opportunities, however I feel the need to say here that the RDA is a charity, manned mostly by unpaid volunteers.
It does not have to provide all disabled persons with riding access. Nobody is entitled to ride with the RDA.
One group I know of caters only for children aged 5-16, mainly from a specific school. Why? Because that is the group its volunteers are trained for, and its ponies are suitable for. It focuses on doing the best job possible for the young people it is able to.
Another group I know refused to continue to provide riding to a child who was agressive and violent. It was tied in with their disability, but none the less, a group is responsible for everyone's safety and could not allow their volunteers to be hurt by this child. Who would want to volunteer in a place where their safety was in jeopardy?
Another group has closed its waiting list and will not take details of prospective riders. Why? Because to avoid overworking its horses it cannot accommodate any more riders. Those already on the waiting list wait roughly a year for a place to ride. To put more on the list would be unrealistic. If I were a disabled person wishing to ride there, I would be disappointed. But unfortunately you cannot conjure volunteers out of nowhere, or feed ponies nothing.
As many here know, horses are expensive. Each RDA group is its own independent charity, raising its own funds. It cannot endlessly accommodate everyone. Many groups own horses and must not stretch their resources so far that those animals go without.
I agree that the RDA is not without its flaws, and I'm sure that some groups are better than others, but I find it suprising that people feel themselves to be entitled to recieve something from a group of unpaid volunteers, providing time, effort, expertise and horses for free. Yes, concerns should be raised, but sometimes the answer is that an RDA group cannot accommodate a person at a certain time, or those volunteers might be be trained to help a particular individual most effectively. In my opinion, concerns should be raised with the group or with RDA National, to bring about change and try to make the RDA the very best thing it can be.