Rubbish the pound was dropping years before the referendum.
Actually it wasnt. It was fluctuating but still holding strong. Unless you are putting it up against the Euro and not the dollar.
It really depends on what data you look at, yes there was a downward trend before brexit, but that trend does not explain the sudden, HUGE drop after the vote.
Looking a the data 2013 and 2014 was a period of relative strength for the UK, with the "lower" 2015-2016 data being very similar to what was seen in 2012/13. It isn't really that the pound was on a downward spiral, it was just returning to more normal levels after a high time.
Beyond that, the Pound was becoming stronger as the vote got closer, as at the time people were expecting a comfortable win for the remain camp.
One other thing that must be remembered is that the old £1 = $1.9 exchange rate ended in 2008 after the economic crash and has since then remained relatively stable at around 1.55 ever since.
A lot of the instability around was after May 2015, where the Conservatives were re-elected, the Brexit Referendum Act Vote passed through parliament and the Brexit vote itself was approaching.
Look at a longer term £:$ graph here.
http://www.xe.com/currencycharts/?from=GBP&to=USD&view=2Y
It is impossible to judge what state the Pound would have been in if Brexit did not happen, but it is wrong to think that it is not having an impact.
I'm not here to start an argument, but blaming these price increases on the companies is wrong. They sell in Dollars and when the Pound's Value changes they need to respond. If the exchange rate was 20% stronger, new products from American companies would be around 20% cheaper, that is simply how things work.
In this Situation, Riot was nice to UK gamers by delaying this change for over a year, when they could have changed it a few mere months after the Pounds drop in value.