Probable final update on this, unless things unexpectedly take a massive turn for the worse- or the thread spins off into it's own direction as can happen!
Contacted the bat maker today by message since he was closed- didn't expect a reply before Monday, but he got straight back to me.
Apparently the 2-12 wasn't finished, so that- with the handle- might well account for the difference in expectations. I'm sure Ollie wasn't factoring in the additional weight of "dressing", whereas the bat maker probably was.
I think we have to be slightly careful with the age thing- whilst Ollie is 13, he's almost foot taller than some he plays with (we lent a friend's boy a size 4 bat last year and he's a year older!). He's also played football against lads that dwarf him! Having said that, 2-13 appears to be heavy even for an adult bat, and I would think it is fair to at least question whether a bat that heavy is suitable. Maybe he could have been more insistent, but I guess if you think that's what's been asked for, then you ultimately have to make what your told (even when the customer is 13!)
Anyway. that's all by the by. He's happy to take some weight out and bring it down to 2-11, no problem.
I've said I'll keep it till after Christmas so it can be opened on the 25th, then we'll send it back for it's post Christmas diet.
Thanks everyone for the input. I wasn't entirely sure what was reasonable to expect with regard to the weight in the first place, or the capacity for a solution. I've always had a really positive relationship with this chap, and didn't want to spoil it by asking for something unreasonable.