There are a number of issues and it likely will affect each industry separately. The main concern are trade agreements that are US-EU vs. ones that are US-UK. The former will have to be renegotiated again or dropped completely with respect to the US-UK trade.
It's impossible to say what will happen in each case as the US will have the upper hand in US-UK negotiations. Also, dropping the UK from the EU is less favorable in EU-US deals than it was as it's dropping a large economy from its market.
However, the election results in the US are probably a bigger consideration in the short term as a huge anti-free trade or anti-immigration election in the US would cause major changes as well.
It's impossible to say what will happen in each case as the US will have the upper hand in US-UK negotiations. Also, dropping the UK from the EU is less favorable in EU-US deals than it was as it's dropping a large economy from its market.
However, the election results in the US are probably a bigger consideration in the short term as a huge anti-free trade or anti-immigration election in the US would cause major changes as well.