Unfortunatly my friend the "cash kings" are very much out there and I for one am finding it hard to compete with them. I personally think the grant scheme is bull. The standard has always been there but just not implemented in the domestic market. When the grant was set up it was for a more "efficient" system and then they started bringing the building regs into it and as everyone knows if you go into 20 year old house the lack of building regs hits you straight away. To expext the installer to bring the installation up to the current ones is way to much to expect and a good bit of the time is not cost affective no matter how much oil or gas goes up.
This thing about the 10sq earth bonding is one example. A lot of older houses dont have 20sq incoming mains so there is no need to upgrade the earth cable, but they still pull you up on it. If they want the cables upgraded get an electrician to do a rewire on the place.
The grants for this are ending in 2013 thank god.