Hello stu, You have to use ericatious (acid)compost. you can check acidity of your home stuff, with strips from a garden shop or good hardware store. Your nearest cafe will be delighted if you collect their used tea bags and coffee grounds, you may have to which both help to keep the soil acid around the blue berries, just use them as a mulch, having emptied the bags first, easier when they are dry. I do mine while watching the I player. You can put lemon, orange and grapefruit peels around the bushes too, quite decorative if you tare them in bits. If you live in a hard water area, it is essential to have water butts. Your water authority will tell you if your local water is acid or alkaline.
When you get your raspberries make sure you buy spring and autumn varieties, for longer cropping
You could make life easier by planting red and blackcurrants, loganberries, tayberries, etc., all of which will grow in non acid soil.
Happy growing. J
