I too agree with all the above, the main thing is to ensure acidic compost and grow in a large enough pot, a friend grows them in dustbins. There used to be a lot of information online from a nursery in Dorset who both sold the plants and had a pick your own business too. The berries were wonderful. These days they only concentrate on the PYO side and all the growing info has disappeared from online sadly but it was basically acidic soil and rainwater only for watering if possible. They have similar requirements to Camelias as they grew them too.
Sorry there is no link to post any more! The PYO would be useful for tasting different varieties but I think the season will be over now if you are near. Good luck