I've tried this a few times to get some better gear in game.
1. go to 1st station
2. get Timmy's leg quest "A Leg Up"
3. kill all the monsters/boss monster in 'Tottenham Court Road'
the KEY here is to NOT search the boss monster's body(there will be a yellow "?" on it, but dont search it).
4. the boss monster will drop some VERY GOOD/Rare items
examples XM107 Firefox Launcher(46dmg+FireField+4mod)[E], Blaze Pistol(15dmg+FireSplash+2mod)[L], Avenger's Phantasmic Reaper(59dmg+SpectralSplash+2mod)[L]
[L]=Legendary item(red)
[E]=Enhanced item(green)
now the troublesome part :P....
5. after taking the boss items, be sure to EXIT game to reset the Quest. by doing so, you can kill the same boss over and over for XP(legit way) and the cool items. now only if there was a quick way to expand my bank....
I've been trying this in single player for hours and it won't repeat the boss loot. Only the first time.
I've tried abandoning the quest, and in fact I'm using an unpatched single-player version, but the boss loot only drops the first time. It's a head-scratcher.
you have to exit game to reset the quest. i recommend kill all enemies on level, then exit to main menu. then when you reload, the quest is also reset.