In reply to All:
Many thanks for responding. One(possibly overriding) problem is that the loan was made about five years ago and I've moved house twice since then. Consequently I cannot find the loan agreement and I suspect he has got wind of that. What I have got, however, is documentation to the effect that the loan is secured on a property which he has had on the market(seen on Rightmove) although it no longer shows up on the Rightmove site. He has told me recently that he is now marketing it through a mortgage company(??)
I'm going to discuss it further with my solicitor.
Post edited at 12:14