Barnsley motor spares number is 01226 717401, normally have large stocks of focus parts and apparently carb cleaner is best to clean all your sensors with just make sure they are well dry before putting back on car.

Ive done abit of checking up for you pal, the pipes i mention on the head which can become block and stop the engine from decompressing are actually apart of the pcv valve on the TDdi, unfortunately the pcv valve is built into the head (camshaft cover) the pipes to check are the ones on the right (nearside) they lead to the oil seperator. The best bet is to clean the pcv valve and oil seperator with engine degreaser but youll have to remove the head and oil seperator from your car to clean them propperly (nothing is ever easy is it lol) Also same as b4 jst check pipes for splits at the ends. I need to do mine as well coz im getting really shit mileage atm lol (35mph at a push)