Discretionary Trust

Hi All

So I am of an age to consider what happens to my adult ASC son when I die. I've done most of the homework and taken legal advice and it seems a Discretionary Trust is the way forward to protect our home and any savings of mine as he won't manage to cope without help.

My issue is that I have no one to ask to be a Trustee for this and although I can pay a legal service to deal with all the tax implications and even to be a Trustee themselves my son needs a local reliable person to also be a Trustee.

My question then, if anyone has any pointers, is whether there are charities or organisations that have any kind of service in this regard. 

Leaving a Will without a Trust set up opens my son to major disadvantage yet in the absence of anyone (family are not an option, friends do not want the responsibility) to work alongside him he will end up being liable for huge fees throughout for a legal service to oversee all the paperwork.

The legal service I have spoken with is happy to work with another Trustee on a minimal basis. 

Surely I can't be the first to be in this situation.

Any pointers wold be helpful. We live in Dorset and I can find nothing locally of any help at all.