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But the inset supreme is a DFE and therefore requires minimum of 100cm2 free air unless stated in the MIs, So does anyone know what is stated in the MIs?

Agreed, start with the mixer tap, if it's working requirements are correct, then check it's not blocked up inside, if new pipework was installed when changed over was it flushed through prior to installing the mixer head or filters. Then also check (if applicable) the single lever was fitted...