That would suggest some sort of plumbing issue, probably a complete loss of water to the lounge. That's pretty bad luck, and yep - I'd have been muttering some words under my breath after the baggage wait.

Was the rest of the lounge working as normal? Were the public toilets in the terminal working? I'm not remotely familiar with how the plumbing works in T5 (I sense that might even prove a stretch for the encyclopedic knowledge of c-w-s), but I'm not sure that's something you can reasonably hang on BA.

That notwithstanding, you obviously haven't just made this decision off the back of this single flight - there must have been more incidents because you don't just throw GGL away without a great deal of considered thought. We've probably all been there at some point with different airlines because we perceive they don't care about us/our business any more. In truth, none of them ever did.

So I wish you luck. I hope it's the right decision for you, as you don't really know until you've made the jump. I'd just check the other forums on FT before you finally make the jump, because I percieve there are similar complaints about other airlines you might jump ship to. Believe me, if and when i have to make a choice between maintaining Star Alliance or oneworld status, it'd be the latter I'd be going for without question.