Gavmacp, I love working with LD and especially challenging behaviours and forensic clients, Where I work the staff are attacked by clients almost everyday. The problem with this is the staff that have been attacked will sometimes get angry and abusive toward the client, some dont understand that these clients will never respond accordingly, they have very little concept of right or wrong and when that switch is flipped they literally have no control. When I get attacked I respond with total calm as though everything is under control and reassure the client that all is fine fine and find a distraction that will often subdue the attack, failing that we are trained in Restrictive Physical Intervention and we then need to take the client to a quite room designated for that client and to suit his or her needs. Many people are not cut out for this work, you sound like you are speaking them correctly in treating them like just another adult, however you need to be on your guard a little, it is easy to say things that may not be appropriate with learning dis clients, you need to look out for triggers, these would be found in their support plans, you need to be very careful of things like innuendoes etc. it can be quite hard sometimes. what one person sees as harmless fun chat may be seen by another as "over the top" sexually or possibly could provoke violence depending on the client type.
Some people have no idea how to interact with these people and experience tells me that if you don't have that ability when you start, all the training in the world wont change that.
As for motivating these people, I would talk about this and put it in writing at each supervision and keep the pressure on, if need be talk to CQC and explain your concerns, they can make a big difference believe me.