Wow. Detailed and interesting report. Glad you enjoyed the experience. BA FIRST cannot be beaten on most routes.
Not sure I warmed to the comments about "going down the back" or going "to the front of the line and telling the lady I was FIRST".... A piece of advice from a veteran traveller in F and C - a true F passenger takes the experience in his/her stride and would never go into Economy as there is simply no need. An upgrade or non-seasoned first class traveller makes a fuss at every opportunity.