Ask Alys: can I grow blueberries without peat?

Our gardening expert has the answerI grow fruit and vegetables organically in my front garden in boarded raised beds. I would love to grow blueberries, but I know they need an acidic soil. How can I create a bed for them without using any peat-based products?
Peat-free soil for acid-loving plants does exist, but you might not be able to get it from every garden centre you visit. The best one I’ve tried is made by Melcourt and is called SylvaGrow ericaceous compost