Thanks for the quick replies and the advice.
I don't know whether I am brave or stupid!
You are neither, the cars are quite simple and easy to work on mechanically, parts are available and there is plenty of advice on line and from the Matra Enthusiasts' Club. If all it needs is a good clean-up and re-commissioning then you've got a bargain. We've got a maintenance meeting in the Midlands in October when there should be some Murena 1.6s to look at and owners to chat to and share experiences, why not come along?