Mine clunks once from a cold start - every time I stop at the junction when leaving work it clunks when I let my foot back off the brake. This is the only time it does it. I hope this isn't the engine mount too - if it is can they be replaced easily?
Engine mounts are quite easy. There a 4. The one at the top of the engine on the offside front strut top is a piece of cake. Their are 2 mounts behind the front bumper. Strictly speaking one's a gearbox mount. These can cause problems as the bolts can corrode and stick in the mount. The 4th mount is quite easy too, problem is I think you have to take the exhaust off to get at it.