Minimum amount of information

I get some phone calls at time, just had one from one of the directors who no doubt had been talking to someone down the pub who had been boasting about how much they'd saved by changing energy providers.

"Can you run another electricity comparison"
"Another one?"
"Yeah, I think there's a Which report on my desk about them"
"Okay I need to know who you're with, what plan you're on and how much you're using"
"I don't know"
"Well I kind of need this information to run a comparison"
"I'll get back to you"

Oh for the love of Fanglemork. Incidentally last time we ran one switching would have saved about £10 a year with most of the saving being lost in purely in the time and effort taken to switch.

[Update - best saving was paying an extra £10 a quarter]