Thanks Ian,
but since we are leaving tuesday, I am out of time to get parts and fit them as we now have to concentrate on other things, but what I did this afternoon was to drill and tap the passages, and fit a pipe between the two heads. Maybe it won't self bleed, but at least it gives me the means to bleed the heads properly, so I am happy with that for the trip to Lemans. Thanks to Paul for the pictures which gave me the confidence to drill the holes
In the morning I finished fitting the rear view camera system and that seems very good both night and day. Last week I also fitted a high level Brake light, tucked in unobtrusively at the front of the rear clip inside the window.
Dave