ive discovered a water pipe in bathroom which has been repaired at sometime with a plastic connector.due to the inbalance of potential diff occuring was wondering how best to remedy the situation.was unsure whether two earth clamps linked either side of the plastic connector would suffice or would this be considered useless?

Yes, two linked clamps would do the job.

But does it need doing?

Is the pipework on each side of the joint extraneous- in its own right? - i.e. can both sides introduce a potential into the bathroom? If it's just a case that you now have a length of 'dead end' pipework feeding taps etc inside the bathroom, it's unlikely to be an extraneous-conductive-part.

- Andy.