FB - thank you for that input, is great to have acess to the mind of experts at the click of a button! I am in north east Scotland, well Laurencekirk to be precise, where the soil is heavy clay - well mostly, but my local whole sale has a 2 for 1 on 100ltr bags of compost - so I bought 20 to dig in! Hopefuly that should help along with some sharp sand.