Brexit, as we have been told by the prime minister, means Brexit. But inflation also means inflation.
The pound has repeatedly lurched lower in value since the outcome of the June referendum and is now the world's worst performing currency of 2016. Against the dollar, it is now worth 20% less than it was before the vote, and that fall is unlikely to be reversed in a hurry.
The basic laws of economics dictate that this will translate into higher inflation: foreign firms exporting goods to the UK will continue to charge the same amount for them in euros, dollars or whatever, but they will cost more in sterling when the prices are converted.