Reality data vertical seperation issue

Is anyone having issues with their reality mesh models not snapping to the correct elevation model?   On Friday my model and reality meshes all matched (both are related to the geoid as native files) but from Monday the Reality Mesh (and Open Buildings model) now sit above by roughly a geoid to ellipsoid error.   I've tried to re-project in Microstation (where everything was still aligned) but still no improvement

I'm working on OSGB36 via OSTN15

(microstation)

 

(iTwin)

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