Indesit is70c making loud rattling/grinding noise?

Our old Indesit is70c has just started making constant rattling/grinding noises when in operation. It's still drying the clothes fine, but is now noisy as hell. The noise appears to change slightly when the dryer changes direction.

Any ideas what would be wrong and if it's worth getting repaired or if it would be easy to repair it myself (I know nothing about electrics)?

I can post a video of the sound it's making if necessary.