As I understand it, a No Deal Brexit will see the UK's current trade deals with the EU cut off immediately without a grace period to renegotiate. It's generally accepted that this will cause the value of the GBP to drop, since the UK will have very little leverage in deal negotiations, so it will be more expensive to import goods, which then falls to the consumer as a price increase. I understand that fine. But doesn't this create a positive feedback loop? If the value of the pound falls, that means it has less buying power, which means prices will increase, which means the value falls... repeat ad nauseum.
Am I misunderstanding something here? Am I simply describing regular inflation, and it happens too slowly to be considered hyperinflation? Or is this a real risk posed to the UK?