Welcome to the forum Marcus :)
youll find the members on here are a friendly and helpful bunch :)
i have the same car with the same engine and it would be worth getting it fixed. I love mine and it's solid as a rock. You say high mileage, what's it on? Mines done 327,100 miles on the original engine and gearbox ;)
it would well be worth you getting a diagnostic check done as it could be a number of things but on the same token it could just need a glow plug!
Cheers
Steve