Central Scrutinizer, a bit more woe to add to your current situation comes in the form of your IR flight test, if you're looking to gain an EASA IR rather than a UK IR. According to EASA regulation ORA.DTO.150, ‘Training in third countries’, IR training requires “acclimatisation flying in one of the Member States before the IR skill test is taken” and that the IR skill test “shall be taken in one of the Member States”. As the UK is no longer an EU/EASA Member State you can't now, according to the regulation, do your flight test in UK airspace, even though the UK remains a signatory to the Standardised European Rules of the Air (SERA).
UK ATOs can apply for an exemption from whichever Member State now holds their EASA approval (or with EASA if they are registered direct with the agency), but as the regulation is classed as 'hard law', any flexibility on the rules may not be forthcoming and enacting changes to hard law is a drawn-out process. IAOPA are apparently going to ask that the regulation is changed to read "shall be taken in airspace that conforms to SERA", but even if this was accepted then it won't happen overnight. And, to be frank, why would EASA or its Member States want to change the regulation when it will effectively amount to a loss of business? As you alluded to earlier, such agreements do not happen quickly and are generally done for political rather than practical reasons.