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 :-(

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If it drains well I'd just put the soil/compost mix on top. It might
not be perfect but it's be a damn site better than most new builds get
these days.