I was caught off guard! I think they want to make sure I keep ‘trading’.
For now, all I want is to hold what I have, but it looks like I’d have to pay £24/quarter for the privilege.
Thankfully I have the app now. 
And so should everyone else soon.
For what it’s worth, this reminds me of the various conversations we’ve had in this forum. E.g. if you buy/sell £600,000+ worth of US shares, you get charged only 0.25% over the interbank rate.
I’m not joking, that thread actually happened.
If you meet some criteria, and you get a good deal, more power to you. But it’s important that my account is with a company I trust has my back and doesn’t arbitrarily change their fees, without any discussion whatsoever, to drive some internal KPI.
In the meantime, no response to my tweet.