Headgasket has let go, its been on the way out for a few weeks as iv'e seen what i thought to be oil in the header tank. Checked it tonight & their is a brown oily film across the top of the coolant

. Headgasket was replaced about 18 months ago (6000 miles) with grpA,had a skim & block is wire rung. The engine really rattles when cold until fully warmed, so i think i might as well go for a rebuild.
Anyone recommend a good engine builder nr Kent.
Cheers Simon.