Thank you for your response but in the easyJet FCOMs it doesn't say this. It says:
ADIRS provides the wind direction and speed. The digital direction and the analog direction (green arrow) indicate the north reference that is in use.
That's applicable to 'ALL' and we have a broad range of MSNs. It doesn't say True or Magnetic on the ND and the arrow and digital read out give no indication contrary to what they say above.
Any other ideas?