For those poor unfortunates who dont live in london I would like to introduce you to fast food curry . The food arrives pretty much as you recieve your change.
TBH its acutally tastes damn good also.
EDIT:
reading the site it talks about the history of tiffin here most interesting.
Scott's Home Online 
The BBC also covered this recently:
http://news.bbc.co.uk/1/hi/world/south_asia/3591040.stm
A friend of mine who’s been to India and seen them in action claims they are allowed one mistake free, then if they make any more mistakes they don’t get paid that day.