Hi.
I would plug the power pack into the 240v first.
There's no real reason, other than if you plug in the laptop first, it will drain the battery (but only very, very, very slowly) until the 240v is plugged in. You're also less likely to get power spikes if there's no load on the power pack when you plug it into the mains, but again it's not something to lose sleep over.
In other words, do what you like.
Dave
P.S. I'll have one of those beers too.
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