I thought and believe that the point of Brexit was to open up avenues to the developing world, of course a positive trade deal with the US would be great and in the interests of both countries.

You thought wrong. The point of it was to retain the tax fiddles being used by the mega-rich (threatened after 2019 by EU tax harmonization rules) and sneak in a Nazi-style enabling law to make a wholesale bonfire of all the progressive legislation created in the last 200 years.

No new trade deal with non-EU countries is on the horizon, and several countries (Australia, |Japan, New Zealand for three) have recently snubbed the UK to make deals with the EU instead. If the US was interested in a "positive trade deal" this prohibitive tariff wouldn't have been imposed. They're treating the UK as another Honduras.

But then you already knew that. A fascist banana republic isn't likely to go after people torturing dogs for money.