I awoke to the one sided comment that prices will rise as we will lose access to the EU ‘s trade deals when we leave. Both the EU and the UK has to confirm with the other party to any given trade deal that we wish to continue as before after seperation. I do not know of any country wanting to end these arragements with either the rest of the EU or with the UK!
The UK government is discussing this with all the relevant countries to ensure continuity.
Once out of the EU we can unilaterally lower or remove the tariff on anything we like.