This forum is for general legal advice rather than specific advice and prohibits the transfer of attachments unfortunately.
CAB will not draft it for you.
Naturally I would always advise taking specific advice from a solicitor to draft one to ensure it is enforceable but if you cannot afford one then the cheapest way would be to download a declaration of trust template from one of the online providers and preparing ia draft version yourself.
I have not used this site before so cannot vouch for any of the offers of documents on it, but here is one site:-
There are others.
Once you have prepared a draft you should take it to CAB asking for it to be checked to ensure that if it were signed then it would be enforceable.
You can then apply to have this registered against the legal title to the property as a Notice which means you would be informed during the conveyancing process of any sale.
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