I've noticed seed prices have gone up slightly this year like most things although having said that we went to a local garden centre the other day and they where selling packets of seed for 50p both veg and flower obviously they where last years seed but still worth buying at that price
as for other things like fertilizers compost's they to have price increases and as for heating the greenhouse that's going to be even more concerning its bound to drive up the price of bedding and other plants come spring and I think there's going to be more cold greenhouses this winter