On Sat, 24 Jan 2009 21:38:55 +0000, Tim S wrote:

What I'm considering doing is to drill some 10mm holes in the dodgey places
and pour in neat SBR until it wont take anymore, in the hope of stabilising
the crap under the levelling compound (which itself is solid and firm).

Might be best done through a tube if possible, so that it fills up from the
bottom.
--
Peter.
You don't understand Newton's Third Law of Motion?
It's not rocket science, you know.