John Kelly wrote:
[...]
It needs to be raised about 3 inches one side and 2 inches the other.
I'm not keen on digging down to get a depth of 6 inches as it's a fair
amount of work and we'd need a skip so that increases the cost by about
£150. Having said that if it's the only way to get it done then I
suppose we'll have to :-(

I'm sorry: I wasn't thinking of raising the level when I wrote my
earlier reply. Poor reading skills: I blame the parents and the
teachers.

What dictates the need to raise the level? This could have a bearing on
the answer.

--
Mike.