The UKs existing laws do not allow the granting of diplomatic status to organizations only to representatives of nation states the existing laws need to be amended.

Why they weren’t and why this wasn’t part of the withdrawal deal I don’t know, probably more oversight than outright malice.

So I’m not so sure it’s petty at least not as of yet as there is no legal framework in the UK to extend diplomatic status to people who represent the EU (or any other organization) but who’s own nation state has not issued diplomatic credentials to and requested the UK to accept them.

If it’s a matter of oversight that EU officials heretofore had not this status then it is surely petty to not recognise the precedent and amend the laws if needs be.

The law does not allow for the recognition of organizations, the fact that it would be a precedence is exactly why it cannot be amended this quickly as the impact on the British legal system needs to be reviewed and understood.

The law hasn’t been amended since 1964 and it has impact on other things including taxation

https://www.legislation.gov.uk/ukpga/1964/81/contents

It’s literally hasn’t been even a month since Brexit and only about 2 weeks since the request came in and about a week since it became an actual issue.

Okay, the devil is in the detail on this one. I took it that the UK said they “won’t” - or are unwilling to - but by your interpretation they say they “can’t” - presently but might like to review that in the future ...