This appears to be a 401/3, the last 401 produced which had anti roll bar at the front, PF770 headlights and the grille was normally the colour of the body.
This could have been changed as can the badges?
The registration is Berkshire Feb 1953, probably Reading and can be checked thro. this link
Berkshire car registration letter code RX
We have the same model 401 registered MXF 682, Feb 1952 in London.