yeh just get a ton bag dropped on site mate with the opc, weather pointings easy enuff, just get it in, let it go right off and cut it in at the top sloping down the the face at the bottom
you come across a firm called 'gun point contracts'?
spotted the van and laffed my head off, ran into the lads in the pub...
they just rake it all out with the mortar rake blades for the 4" grinder then they got this mortar pump with a gun on the end.. do a house in a day and a half..
might be worth seing if you can hire one o them machines..