Jackie-gardener. Have you tested your "normal" soil for acidity? It would be difficult to keep your soil in 2 different states like this. If you are growing camellias pieros etc you must have acid soil. The soil you are trying to dig, full of roots, can you dig it thoroughly? I would say you prob have acid soil anyway. You won't have too many,worms in your acid soil anyway...? Why not mix the whole area together? So, you bought normal multipurpose compost for half and ericaceous compost for the rest...? What plants would you like to grow here?