Hello Brian,
As Steve says, blue smoke is indicative of engine oil being burnt, and would not be the colour of exhaust gasses you would expect from ‘regeneration’.
If this were mine, I would take the car on a 10 mile run to ensure the engine oil is up to operating temperature, then get an assistant to follow you and observe the incidences of blue smoke emission.
It would be expected that if it was due to valve guide/seals were that the blue smoke would be evident on moving away from being stationary at idle at traffic lights etc. If the blue smoke occurs on general acceleration, then that would indicate issues with bore/piston wear.
Does the car burn any oil?
Kind regards,
Gareth.