Same here. Have now seen significant heather honey in September only 4 times in my whole time in bees...........which is now...with my father and myself.....over 50 years. What may or may not be significant is that two of them have been the last two years, when the flow has continued until between the 12th and 14th. Unless there is significant nectar coming in we *usually* start stripping the hives around 5th September.
Doubt September flows will be the case this year. Heather is browning (a week from now there will not be much left) and the bee power declining. The flying bees have thrashed themselves near to destruction in the less than optimal conditions up here. Lots of tatty wings now on the flyers. Hives look very healthy however, bit worried about the lack of laying space in the nests. Many colonies stopped moving it up during the poor weather of the 17th-24th Aug here......decaying remnant of Hurricane Gert just sat off the Western Isles for a week dropping seemingly constant rain. At the same time it pumped really humid weather across the 'golden' spots, which seems to have been a stripe from Devon to Yorkshire (and as there is not much heather in between those you get the impression of it being only two areas). Was not especially cold though but we did get some storm damage, particularly in a couple of windy spots.
Its not a disaster season though. Heather crop will probably be on the upside of average as they got off to a cracking start, and the 'filling in down' that is happening in the recent days does add significantly to the final tally.