I have since found out that the B1s only had dark markings...
Fixes:
Markings - now standard dark type
Fin - changed black area.
Serial number font - changed
Wipers - added
Bomb-aiming position - reduced overlap.
Canopy - fixed lifting hole - reference drawing wrong.
Intakes - fixed - again reference drawing showing B2 inlets on B1 drawing...
Moved nose window.
Changed the dark areas on the spine and fin (think they a radar/radio related, not sure)
Added wing roundel
Added nose markings for rescue and first aid stuff (not that they can be seen much)