Of the 430k businesses in the UK that export, each can expect to pick up an additional £80k of costs in tariffs alone.
We trade currently from inside the EU, so any agreements would end and we would essentially have to start negotiations with each country. If we wanted to access the 27 EU countries, we would have to meet EU standards.
I highly doubt they would be able to negotiate with any country until the EU part is done either way, so stalemate until a decision is done.
Then, business would need to begin readying itself for export, training needs to take place, no doubt the port services will need expanding.
Currently the transport market is very competitive, keeping supply chain costs low. A switch to trade by boat rather than road will see a shift from competitive to captive. Each container cant hold as much stock as a lorry, so there will be a higher cost per pallet. Container supply is very volatile and delays are a lot more costly.
WTO is a great line to throw but no-one in their right mind would openly say it's good, it really isn't. If were ok, then why even negotiate deals. Simply put, the winners are the government, the losers are the consumer.