Don't go shopping with a hangover...

Have you ever been shopping with a bad hangover?  I do it quite often.  Traipsing around aimlessly with my one brain cell.  I walk in with no idea what I want and am often surprised what I end up with.  It's never a good idea to go shopping when you're hungry either.  All my healthy ideas go straight out of the window.  
Above is Waitrose in Marylebone, a shop I've spent a lot of time in.  My