Hopefully I won't get too much grief for this, but I'm a born and bred Boro fan now also supporting Chelsea. Having returned back to London 2 years ago after 20 yrs abroad and with an escalating Anxiety disorder (related to undiagnosed dyslexia) I was advised by my Dr to get back into things that I'm passionate about....ie going to live footie games.
Getting back to Teesside every other weekend wasn't an option due to family commitments so I decided to go and see a game at a London club. Having good memories of the atmosphere/passion at Stamford bridge going there as a Boro fan in the 80s & 90s (and less fond memories of being chased across SW London after one particular game ? ) I decided to go and see Chelsea vs Newcastle.
....anyway, long story short, loved the atmosphere in the MH end and have been to pretty much every home game since.