I am back at my sisters due to the incompetence of BA. My flight was at 2140 and I arrived at LHR at 2015. As I had already checked in 24 hrs earlier I went straight to the bag drop. I showed them my boarding card on my tablet, the guy scanned the bar code and everything was hunky dory. I had a quick beer and a fag and went through security at 2100. I had to go through no later than 2105. The barcode scanner at security could not read my barcode on my tablet so I was told to go to a check in counter to get a printed boarding pass. I did this asap. The lady made a couple of calls but was told because it was 2109, I was late so they wouldn,t let me on the flight. I asked to speak to someone higher up the chain so a guy came along, made a few calls and then told me that as it was now 2120 I could not get on the flight. I have never been late for a flight in my entire life and now have a very upset wife and 8 year old daughter who were expecting me home in the morning. What to do next?