Tudor, I think a lot of it was soft hail or graupel which blows around
easily in the wind and drifts. Also mixed in were small hail (looking at
the picture showing footprints).

From what I can make out now, the 'drifts' were formed by water carrying the
hail along. This explains why the hail has collected in places that it has,
likes dips and drains.

The fields around here still have piles of hail in the hedgerows where the
rainwater running off the fields carried the hail but it got 'filtered out'
by the hedgerows. Other examples of this are everywhere.

There was very little wind and the hail and rain was coming down vertically.

The hail was white/opaque and consistently around 5 mm in diameter. There
was definitely no snow falling at any time. The DPs were around 5°C for most
of the event itself which was from 00:00 to 02:00.
________________
Nick.
Otter Valley, Devon
83 m amsl
http://www.ottervalley.co.uk