Thanks for the responses, both.
I'd love to visit a few smallholders in the area! Though I suppose I'm really looking more to grow / own woodland (and perhaps a few chickens) then to be a full on smallholder. Don't have too much time to spare at the moment, though hopefully that might change. And my wife (and myself to a lesser extent) don't want to go tooooo far from Bristol for a range of reasons - jobs, friends, nice city, good shops and resources etc. Also to be close ish to OHs parents, for child care duties (one day, not yet!) We don't want to live right in the middle of nowhere...
Though all of this is negotiable, for the right property / land! We almost viewed one place, a good hour from Bristol, up near Ross on Wye, that had 25 acres of land and was a former farm. It sold before we could get the viewing finalised, however. But in retrospect, perhaps 25 acres is a bit much - I'd like to enjoy our bit of land, not be a slave to it!