first bit of good news.
Took her for a quick 10km to bring her up to temp.
Carefully took it to redline a couple of times....no smoke
Seems to still run strong.
Still got hot because I have no coolant flow.
Other than the obvious..ie pulling the bumper and trying to empty the rads of the gunk, is there anything else is should clean to get it flowing and is there an additive I can use to break down the oil?