The 18-06 rainfall totals weren’t massive from the frontal system associated with low Quinn, but rainfall since o6 UTC was fairly heavy in parts of the east Devon, Somerset and Dorset (fig 1). The rain might have been behind a couple of road traffic accidents that have led to the closure of the M5, and some local flooding in our part of Devon. It shouldn’t be long though before the clearance behind the cold front brightens things up down here in southwest England.
I would say that a secondary low centre was developing on the triple point in the Bristol Channel at 08 UTC, but I can’t find any sign of warm air! You could almost draw the trough down the 4° line of longitude it’s that straight (fig 3).