I can only say a heart-felt word of thanks to all the cabin crew who have brightened my day/night with a cheery visit to cockpit, usually sporting a hot cup of tea! I appreciate their efforts to look after me and do not now nor have ever taken them for granted. I would also add that on occasion, when tired, grumpy and generally not at my best, I may have come across as slightly less than sociable....! It is perfectly acceptable to tell me i'm a 'miserable git'......!! Cheers.