I see Bibio pomonae is also referred to as the heather fly, and that is where I was. Just close to heather moorland where I was also looking for golden-ringed dragonfly. Bibio were pretty much everywhere.
That's probably why I haven't seen one yet Geoff! I do have a bit of wild heather though, I think Calluna vulgaris self set which is increasing nicely! I'm on heathland with old woodland type country but the heaths must have mostly gone.
I guess you didn't find the Golden-ringed dragonfly?