Wago connectors, installed and derated in the correct Wago box, according to the instructions, comprise a BS 5733 MF accessory. Other connectors, or other enclosures, or the wrong combination of connectors and enclosure, may not.
TBH, it is not a situation which makes any sense at all, or is satisfactory, and although it will take a chunk of time, I'd advise sitting down with a cup (or large flask) of tea and the last of your mince pies, and reading through all of these:
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