Quick heads up for UK Focus drivers - This sorted out my wiper problem.
Just drop the glovebox lid to access the fuse-board and remove the two brass screws to move it back enough to get at the relays. Looked around for a alternate supplier but found that the relay was only £5.69 from my local main dealer.
Can't believe I suffered for 2 yrs thinking I'd have to replace the motor or such-like. :-)