if its a clutch problem its more likely to be the DMF starting to break up.

The first signs are the noises mainly on tick over maybe a slight knocking, you may then find that the starter plays up and doesnt engage properly, this will be the bits of flywheel affecting the starter.

To be fair after you get the starter cleaned you really ought to be looking at getting the DMF and clutch changed as it will get worse and will clog up the starter more and more.

£540 is a good price for all the work done, mine cost me about £700 and that was with a good discount from my mate at Ford for the parts.

When/if you get it done remember to change the £5 rear crank seal behind the flywheel as this starts to leak with age and if you dont do it with the change over you'll be paying some one a lot of money for this seal at a later date.