Can you summarize which points do UK is diverging on?
It's a little bit uncertain in some areas. Obviously the import/export requirements are a new thing, but there is actual divergence starting to occur on the food regulation side, via two different routes:
1) EU changes made since Brexit, which have not been implemented in the UK. Examples include e.g. contaminants regs (1881/2006 amendments) and additives, with withdrawal of the authorisation for titanium dioxide not applying in the UK. It's therefore still authorised in the original categories here, at least in England/Scotland/Wales - as Northern Ireland still follows EU regs, it is no longer authorised there.
2) UK changes since Brexit. For example, pesticide authorisation and MRLs are now set nationally here. Additionally it's been set up such that, unlike the EU, a regulatory amendment isn't required to change an authorisation or MRL - instead it is done via an official register.
As for further changes, it's currently a giant unknown. The law that moved EU regs into retained UK regs included a "sunset" date meaning that most of these were due to automatically expire at the end of this year. There was a (frankly ridiculous) proposal to completely rewrite all food regulation ready for this, but it is laughably impractical to redo such a large and complex body of law with the limited resources available in that sort of timescale, so in practice this won't happen. What the next few years holds is really anybody's guess though.
Many of our non-UK suppliers, and particularly those outside the EU, are already complaining that it is becoming very difficult for them to determine if their products do or don't meet current UK regulations, and that seems likely to get worse rather than better 
