Googling around, the passenger side engine mount seems to crop up as being a problem - firstly, is this the right part - [url="http://www.fordpartsuk.com/shop/ford_focus_engine_transmission_mounting__f_1133019_c_597.htm"]http://www.fordparts...33019_c_597.htm[/url]
EDIT - just been thinking that the sites I was reading info about the passnger mount on were American - so I assume that their passenger side, would be our drivers side - so the hydraulic mount, not the one I've linked too above?
Secondly, is there any way of 'testing' the existing one?
Many thanks