I suspect it will be used as a negotiating chip. Britain has the best of both worlds here, we can negotiate with the Washington, but then the EU is our biggest trade partner and long term we might undo some of the Brexit pains standing by Europe. And of course we know China and Russia would love to buy our steel produce if the yanks don’t.
It’s not perfect but the pound has only seen recoverable loses today and we have options. We’re probably the only affected country not shitting ourselves.