Agree there mate.
Noticed that over the last few weeks,they drink very little,I always put a litre of water in each drinker,I now put half a litre in and still throw some out when I remove the drinkers in the evening.16 pigeons in each section.
I like the idea of a 12 volt bulb,if the lofts hadn't been at the back door I would have went down that road,maybe an idea for you fanciers going to Blackpool,a 12v transformer or battery,hole cut in top of the drinker cover ,car light fitting secured and a not too high wattage bulb used ????????? can only try.
Lindsay