Wow Dodziu
That's a serious amount of time also, even when you got your additional info back to them as quickly as you did!!
I'm 2 weeks in now still getting more info together but should have everything ready by mid next week and still well within the 28 day timeframe, but by the look of things there will still probably be a significant wait for any final decision and that's assuming they don't want even more info further down the line.
Full sympathy though and there was me thinking we were the only ones - I guess all any of us can do is do as they ask, be patient and hope for a positive outcome!! It's also slightly comforting that we are not the only ones as I was starting to take it personally ha ha!!
Will let you know if anything changes and good luck!