I think because you agreed to split the bill at this more expensive restaurant and you knew from ordering that you were having way less than everyone else then no, if I was you, I wouldn’t have said anything on the night and I definitely wouldn’t after the fact.
You chose to have much less than everyone else, knowing what they were ordering and drinking.
I think you’re focused on the special being so ridiculously expensive. But really, it couldn’t actually have made that much difference to how much you paid.
If your 3 friends had mid-priced mains instead the bill would only have been around £180 less. And they paid £45 of it. Leaving less than £150 extra on the bill. Splitting that between you all is only around £10-15 each.
So most of the extra you paid came from paying a tenth of everyone else’s starter and wine. That would easily have added £40-50 to your bill.
And you still say you were happy to do that.
Also, your main at £25 plus a glass of the wine (at £45 a bottle) and your share of the tip, you would have been due more than £40. And it sounds like the kind of place that would charge for water.
I get it’s annoying paying so much more. And you definitely got stung. I hope it was just annoying. And that by paying it, you didn’t leave yourself short of money that month.
first question to ask yourself is - do you think anyone else realised you had so much less and we’re paying so much more? You didn’t have a starter so that’s noticeable. But how much wine people are drinking is hard to keep track of.
second, if you really hadn’t wanted or been able to pay that much more and you’d said so, what do you think their reaction would have been?
because it seems they all happily paid a share of the expensive specials because they didn’t want your three friends to each have an extra £50 or so to pay themselves. They chose instead to pay just £10 each instead. Those are great friends to have. I’m sure they’d have done the same for you if you’d been one of the three.
and the three who bumped up the bill (clearly by accident) did still insist on paying extra. And that extra would have made things reasonable for most folks. Again, great friends to have.
I think maybe you’re underestimating them and yourself as one of them by focusing on the negative experience you had this one time. Rather than seeing how positive this would have been for you if you’d been on the other side of it.
if the issue is that you can’t afford to spend that level of money on a meal - whether you’ve eaten your share or not - and going to these places becomes a thing then next time say that you’d rather not go somewhere so pricey. or agree that if you go, you will only be able to put in enough to cover what you have.
if you can afford it and it was just about being annoyed that you paid so much more that once, then just even things up over the next few meals out.
And look out for other folks being in that situation and make your point by insisting they pay a lesser share. That’s a good way of addressing the issue of fairness in these situations. And others are much less likely to react badly when you’re speaking up for someone else