In reply to:

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But my post displays an annoying lack of info over tuner kits -- surely it's bang on-topic?

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Certainly seems on-topic to me..
And as far as the whole differently-sized glass, maybe the waitress just LIKED you better? (Hey, it's possible.. Right?)
'Sides, now that someone mentioned it, what pub do I have to call to get ya'll a drink? (And I'll do it, too. Assuming I can pay for it over the tele... Hmm.. "Yes, I'd like three pints of your best for three chaps that will be in later tonight. Do you take Mastercharge?")

Me.