Last yoyo in London!

Hello!!
I'm 34 and a workaholic with a less than lightly active job taking up at least 100 hours a week.
I've gained 70 pounds in the last ten years (WHY DID I DO THIS TO MYSELF???!!!) after I gave up the heavy sport I used to do during my undergrad years. Have lost 40 lbs a good few times and gained more back with a vengeance.
Determined to lose 55-60 lbs, it gets harder every time, but for good this time. Need some buddies to help me though!