blickie for the link above with address it is about 3 times as far out of town as the festival site and doesn't look to be suitable for the B&B equivalent. There is a similar site on the main road past Bromyard, right at the lowest point. Basically mostly residential "trailers" (aka caravans).
Tourist information centres will (for a percentage fee) ring round and find (subject to availablity) for you and they will have a list of ordinary people who do it on an ad hoc basis - especially for the festival.