I know more people who have ruined car engines by failing to get the cam belt changed on time than any other mechanical problem. The Capri's cam belt should be changed every 50,000 miles to be on the safe side. If the belt snaps when the car is at speed, you will only damage the pistons and valves if you're lucky. Changing the belt is a fairly major job but it's a lot easier than you would imagine. See my other 'jobs' page for the gruesome details. I suggest for the service, you remove the cam belt cover which is the metal cover in between the front of the engine and the radiator fan (it has three 10mm bolts securing it.
Inspect the cam belt for signs of cracking, tearing, splitting, fraying and contamination from oil. If you are concerned, get it replaced.