Why on earth would they risk that?
Because if they give us whatever we want, others will want the same. This is politics, not rational arguments.
That's about £41bn trade surplus they'd be kissing bye bye to.
No, they are not kissing it all bye bye, a tariff is not going to stop all of it, is it? It may affect it negatively, but to what extent, 5% decrease, 10%? They may think that worth it.