Found the problem, it was the coil pack (simple stuff). It is now fixed, runs great and the random clicking has gone from behind the clock. I read that it quite a common problem with all Fords apparently. Symtons were as described, more of splutter rather than a miss (a bit random, but there you go).

If people still have issues after this, check your fuel filter/sensors/relays (if you know what to look for) or get a diagnostic check before conducting further work in striping stuff down to clean/repair etc.

Hope this helps.