I completed the final coat of the LDPM on the walls last night and apart from touching in a few areas that's it for the bitumen paint.  I didn't take any more photos because, well,  one coat looks much the same as three, ie. black.  I'll need to clean up a few splodges on the floor, I did keep it pretty well covered whilst brushing on but there's always  the odd splat that gets through.  Just working this out, it's taken a little over six weeks to get to this stage.  Which isn't bad considering the limited time I have available.