Originally Posted by
Brewster Buffalo
OP is referring to the Comet at the National Museum of flight at East Lothian as pictured in the Guardian today.
That one's a 4C, not a 4B.
As Jhieminga says, the only 4B still around (after the scrapping of the tug tow G-APMB at Gatwick some years ago) is the Science Museum example G-APYD.