Daylesford is a gorgeous farm near Kingham in Gloustershire not far from where my daughter lives with her family, and she never fails to take me there for lunch every time I visit. It is an absolute treat. The farmshop sells their own farm grown meat, fish and vegetables and it has a dairy and creamery. In addition the shop sells kitchen accoutrements of very high quality and the most wonderful baskets (my obsession, but I can't bring them home).
If you can't get to Kingham there is a lovely farmshop and cafe on Pimlico Road, Pimlico in London, one also in Notting Hill and also in Selfridges Food Hall so there is no excuse for not visiting!!