I have it on good authority that our soil is fine. What we have to do now is double dig and here is how:
Begin at one end of the plot and dig a spade's depth (about 12") trench across the plot putting the earth into a wheelbarrow.
Work a fork into the trench to loosen the soil.
Dig a second trench next to the first and put this soil into the first trench as you go.
Work a fork into the second trench to loosen the soil.
Dig a third trench next to the second one and put this soil into the second on as you go (the first trench is still in the wheelbarrow)
Continue until you have completed the plot.
Extremely hard work but hopefully it will pay off.