Which means there is more potential to grow trade with the US than there is to grow trade with Europe, because the latter is already high.
Not necessarily, the largest value of UK exports to the US is cars (£9bn) which have a flat rate of 25% wherever they're from, so it's unlikely we'll get much opportunity to create growth there.
The list then starts to drop away fairly quickly:
Cars: £9.0 billion
Medicinal & pharmaceutical products: £6.5 billion
Mechanical power generators (intermediate): £4.6 billion
Scientific instruments (capital): £2.4 billion
Aircraft: £2.2 billion
Those 5 things account for nearly 43% of all (goods) exports from the UK to the US.
For services the numbers are:
Other Business Services £52.3 billion 42.1% a decrease of 0.9%
Financial £27.8 billion 22.3% an increase of 6.6%
Insurance and Pension £11.0 billion 8.8% unchanged
Telecommunications, computer
and information services £10.3 billion 8.3% an increase of 7.2%
Travel £8.2 billion 6.6% an increase of 7.5%
Which accounts for 88% of all (services) exports.
To account for (say) a 25% drop in UK car sales to the US IT would have to grow by about 18%, that's doable, but probably over a longer timeframe than one year.
There's also the question of how much of that trade is actually worth other north American countries. For example if a car is sold in a US showroom to a Canadian where does that sit in terms of trade?
Whilst I suspect the values aren't that high, with Canadians boycotting the US (including refusing to travel there) we may see some of falls in exports to the US be taken up by increases in exports to Canada and Mexico.
With the Canadians selling up property in the US, not travelling to the US and not buying US products (both at a personal and government level), there's a fair chance just from the impact of the Canadians that the US will struggle to see growth this year.
That's before you consider than many EU nations are now looking at what defence spending can be undertaken "locally".
There was already concerns around Boeing (with regards to safety), so that's not going to be helping either.
With US consumers being taxed if they buy non US products (as that's effectively what the tariffs are) their spending power is going to be weaker, so they're going to be looking to tighten their belts - especially those who work for government who are looking over their shoulder grading that they may no longer have a job next week.
Personally, I'm not sure that there's much how for growth in experts (of whatever variety) to the US unless we get the same tariff rate as Russian imports (which is no extra on their $3bn whilst places like Ukraine got 10% on their $1.2bn, and in not sure how much the penguins export but likely a lot less than $3bn).