After a week or so of not being able to get in to the garage, I started the attempted clean up of the engine yesterday.
As you can see, to begin with it is black and covered with 12years and 155000 miles worth of sludge..
Got hold of some soluble degreaser as recommended by the resident engine overhaul god (Kev). The stuff I got foams up which is good for getting in those hard to reach places. I also have some 'Gunk' which I have also used.
After an hour or so of scrubbing with a wire brush I was beginning to think the block came out of it's casting black, until finally, a glint of silver..