The pound is 100% in the shitter. No, we haven't left, but there have been massive economic shifts due to it, most notably in the value of the £
Before the referendum, $1 was equal to £0.68. Now, it's equal to £0.82. For Yen, £1 was equal to around 158 Yen prior to the referendum, now it's around 135 Yen
As such, when you're a company from outside the UK and are having to sell things in the UK, you will either have to eat a significant loss or alter your prices. We may not have left yet, but to say we haven't suffered effects from it is grossly erroneous
Also, don't forget that UK's price is with 20% tax while US's is without tax. Average tax in America is 14%, so US price would end up, for most, to be around $340 which, when converted is £280. Just for note, before the referendum if you had done the same conversion, it'd have been £230