Further invest showed the glowplug on cyl 1 has detached in the middle so have removed and ordered another set, will try to remove the rest (Gonna be a pig i reckon) and check condition and change them on spec, and see what happens, the fact of unburnt fuel was the promping factor to check them as i was under the impression the compression ignited the fuel and the plugs were just for v low temps, but having visited the manufacturers website the reckon the engine block needs to be warmed to provide a good combustion enviroment. Will update again when fitted as it may help someone else.

Ian