So I got the chassis numbers from the (3) P3s and the 1935 Streamline this evening.
They are:
RHD 1948 4 light 60 8230058

LHD 1948 4 light 75 L8431085

LHD 1949 6 light 75 L8413301

RHD 1935 Speed 14 531040

When I get time I will also forward the chassis numbers for the other running board Rovers.
All the Best
Dirk in the States