I've noticed more recently that GW has been a bit more instructional rather than "hey look at my wonderful enormous garden and oh look, some box hedge!" which it seemed to be in the first season after Monty returned. There has to be a happy medium between simply watching and marvelling at gardens and educating the masses. In half an hour, that's a pretty tall order. Beechgrove seems to be mostly demonstrating how to grow a garden, with lots of trials (and errors).
Perhaps the BBC can look at taking off air some of the dross they put on during the day and replace it with a daily gardening show, using real people's gardens and allotments. It would still only need one or two presenters and cheap TV but can you imagine? We've had enough of Cash in the Attic, Bargain Hunt or Homes Under The Hammer. How about Grow your Garden or Green Fingers.