From observation of our cars on the road I always reckoned as a rough rule;
up to T reg Speke
V to W reg Canley
X reg Solihull
Y reg and onwards, Solihill leftovers of which I saw plenty sitting on the books of Henlys wholesale dept in summer 1981.
It doesn't surprise me that some cars weren't registered until well after manufacture since loads of BL cars with delivery dings or paint defects sat for months on end there awaiting rectification, including 7's. Plenty of our cars were on the books unsold for ages anyway.
I remember seeing a couple of A reg 7's around North London at the time. I'd heard of a B but never seen it.
Adam
TR7 V8 DHC Jaguar Solent Blue. 9.35cr Range Rover V8, Holley 390cfm, JWR Dual Port, 214 Cam, Lumention, Tubular Manifolds, Single Pipe Exh, 3.08 Rear, 200lb Spax & PolyBushes, Anti- Dive, Granada Vented Discs & Calipers, Braided Hoses, 4 Speed Rear Cylinders, Uprated Master Cylinder & Servo, AT 5 Spokes and Cruise Lights. No Door Stickers. Mine since July 1986, V8 from 1991