Following on from mark, please could you add stuff that can be bought in.
We went over the Harlow Carr again today and I bought some bags in which you
can grow potatoes. I bought a small pack of seed potatoes 'Colleen, First
early, Organic' I didn't really know what kind of compost buy so I settled
on 'John Innes no 3, soil based'

I will do what mark has done to start them off.