Are you seriously suggesting the UK has a trade deal with the EU similar to the one Canada has? You realise that it does not include services and the significant advantage of passporting rights. The UK has a trade surplus in services with the EU and that's where the money is. Any trade deal involving goods only is not going to help the UK as it runs a trade deficit.
The UK is batting on a very sticky wicket and May is going to have to concede more before October for the UK to maintain any economic growth in the near future.