This is inevitable. Last June 22 the euro to pound ratio was 0,76, today it is 0,86.
This means that the lucky euros that have ordered a m3w before the referendum will now pay (VAT included) about 44.000 euros, and not the 50.000 they had as budget.
And that's 15 days later. The pound today reached new historic lows, we still don't know where it'll bottom or at least level.
