HI Dave, appreciate the response. Does seem an odd problem as its fine when turned off then back on. Ill certainly get the battery looked over, its not a great brand it has gone flat on me a few times, plus it only gets used every other weekend so is quite possible.
I cant put a date to it but i have paperowork for parts to do a service so i would imagine it has been taken care of not so long ago. I think my best bet is to get the battery looked at. I dont want it to become a reason to sell again as i love it, even though its 17 years old, just drives unlike the new cars now.