Hi Alan, just out of interest has it had a new battery at any stage if so what make ??? I'm thinking crap battery syndrome we find certain battery's normally the black ones with orange logo's on do some strange thing's not unlike this.
As an aside we've just had a 2004/5 Espace which we failed on mot for main beam not working after a look we declined to repair customer took to renault who removed dash,replaced wiring loom/engine harness & cabin & fuse box £1800 bill but renault paid £1597 as a goodwill claim so thing's are not looking good on the wiring front generally .Queue Mr Sefton for his input on the subject