Eventually got a bit quicker internet access. Here is a link to a document I made from instructions and pictures sent to me by oldchris, it shows his method of locking the satnav cradle using the central locking on the RT LC. If you try it please pass on your feedback to help others. I haven't tried this yet, I haven't even seen my new bike yet!
It is your choice whether to do this, we take no responsibility if it affects your warranty or whatever else may happen as a result of trying.