sorry should have updated this :oops: Its annoying when you follow posts which arent resolved. I bought a new set of dash clocks from a breaker and the problem disappeared. I should add there were also odd temp lights flashing occiasonlly and the glow plugs acting up. This all stopped too.
I got advice from my girlfriends dad the electrical engineer and he said the board could be fixed using the liquid metal stuff that someone else suggested. He said you dont need to be hugely careful. Laminate the back to stop the split moving, peel back the plastic and paint the strips on liberally with liquid metal to ensure a good path. Where they touch, which is inevitable in such a small space, scratch between them with something sharp to remove the offending bit of metal.
This is still on my 'to do' list as the new clocks meant i didnt have to do it.
I'd take the clocks out quickly and check the board for damage, check the grounds are working, no obvious fried wires etc, and preferably beg, borrow or steal a spare set of clocks to try in the inevitable event that nothing obvious presents itself.
Word of warning when dismantling the dahboard. Pay attention to where the screws come from as there are two very slightly different sizes which if put back incorrectly will make the dash a very annoying few millimeters out or position. Be gentle too as my mate broke a plastic mount being overzealous helping putting it back together.