I am unable to get QGIS 3 to give me areas in Cartesian measurements.

My project is in CRS 27700 BNG and when using $area in the attribute table the values are returning in ellipsoidal measurements which are enormous numbers compared to their true sq metre expected result.

I have checked my options > map tools options and everything is reading in metres.

Is there a quick setting to fix this as I can't figure out what I have done to make this happen?

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