I should also have said it would be sensible to use engineering brick (class A or B) up to 150mm above ground to act as DPC, although not essential if you are not planning to render the wall.
Would it also be an option to use a trench fill foundation shuttered above ground level or alternatively use high density blocks below ground level up to 150mm or install a DPC above ground level?
Best option would be to use a couple of courses of slate in a 1:3 mortar to act as a DPC. That way you can use blocks below. A Visqueen type DPC is not suitable as it will create a weak point in the wall, although, if you are not planning to render it, then really there is no need to worry about a DPC at all.
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