This may not be appropriate within this 'Designation' section (Mods please feel free to delete).
I was looking around for a listing of British Dec 1923-Jan 1948 B Class registration number and couldn't find one - many such numbers are available online but not pulled together into a list. So, I have compiled such a list for de Havilland (which was assigned the 'B' class letter 'E').
Here's the problem. How B Class numbers were to be assigned was left up to each company. De Havilland simply 'recycled' their registration numbers as airframes gained full civil registration, military serials, were written off, etc. So, finding an example B Class registration number is hard. But how to determine if you've got them all?
A note on style. In most cases, de Havilland B Class registrations were painted on airframes as 'E.1.', etc., a full-stop between the 'E' and number and after the numeral. The only exception I've seen is 'E.8' on a D.H.94 Moth Minor.
Related is another series of larger numbers. Examples found are E-0222, E-0226, E-0232, E-0234, and E-0235. Does anyone know why there were two series of 'E' numbers? Or can anyone add to the 'E' numbers list below? (I am especially curious about the 'missing' E.15.)
De Havilland Aircraft B Class Registration Numbers
E.1. = D.H.80 Puss Moth prototype (later G-AAHZ)
E.1. = D.H.82A Tiger Moth (later N6791, D-EDYM)
E.1. = D.H.85 Leopard Moth prototype (later G-ACHD)
E.1. = D.H.87A Hornet Moth (later G-ADIR, RAF W9387)
E.1. = D.H.87B Hornet Moth (tricycle?)
E.1. = D.H.88 Comet prototype (later G-ACSP)
E.1. = D.H.88 Comet (later G-ACSS)
E.1. = D.H.88 Comet (later F-ANPZ)
E.1. = D.H.94 Moth Minor prototype
E.1. = D.H.94 Moth Minor (later E-0236, G-AFOJ)
E.2. = D.H.60M Metal Moth (later G-AAWU/VT-AEW)
E.2. = D.H.82A Tiger Moth (later Persian AF P124)
E.2. = D.H.82A Tiger Moth (RAF T5541, later D-EDUN)
E.2. = D.H.86 Express (later G-ACPL, RAF HK844)
E.2. = D.H.92 Dragonfly (later G-ADNA, RAF X9452)
E.2. = D.H.91 Albatross first prototype (later G-AEVV)
E.2. = D.H.91 Albatross airliner prototype (G-AFDI)
E.2. = D.H.94 Moth Minor
E.3. = D.H.82A Tiger Moth (later Persian AF P125)
E.3. = D.H.82A Tiger Moth (RAF DE482, D-EDAN, D-EDAM, D-EHHT)
E.3. = D.H.88 Comet (later G-ADEF)
E.3. = D.H.90 Dragonfly prototype (later G-ADNA)
E.3. = D.H.91 Albatross mail carrier prototype (G-AEVW)
E.3. = D.H.92 Dolphin (later G-AEMX)
E.3. = D.H.94 Moth Minor (later G-AFRD)
E.3. = D.H.93 Don prototype (photographic evidence)
E.3. = TK.2 (De Havilland Technical School) prototype (G-ADNO)
E.4. = D.H.94 Puss Moth (later G-AFRD)
E.4. = D.H.60T Moth Trainer (later G-ABKS)
E.4. = D.H.82A Tiger Moth (later N6779, D-EDON)
E.4. = D.H.84 Dragon II (later G-ADOS, RAF HM569)
E.4. = TK.4 (DH Technical School), (later G-AETK)
E.5. = D.H.60T Moth Trainer prototype (later G-ABKU)
E.5. = D.H.60T Moth Trainer prototype (later G-ABKU)
E.5. = D.H.60T Moth Trainer (G-ABNJ, SwAF Fv6562)
E.5. = D.H.82A Tiger Moth (RAF T5823, D-EDES)
E.5. = D.H.91 Albatross ex-E.3. (K8619, G-AEVW, AX904)
E.6. = D.H.84 Tiger Moth prototype (later G-ABRC)
E.6. = D.H.84A Tiger Moth (RAF T7356, D-EDUM, G-ASPZ, D-EMSY)
E.6. = D.H.87 Hornet Moth prototype (later G-ACTA)
E.6. = D.H.89 Dragon Six prototype (later CH-287)
E.6. = D.H.94 Moth Minor (later E-0226)
E.6. = D.H.94 Moth Minor (later G-AFSD, VT-AMF, VP-CAG, NP490, VP-KDB)
E.7. = D.H.81A Swallow Moth prototype (mod. from unreg. D.H.81)
E.7. = D.H.82A Tiger Moth (later N6805, D-EDY)
E.7. = D.H.94 Moth Minor (later G-AGAM, VT-AMD, RAF HX796)
E.7. = TK.2 (DH Technical School) ex-E.3., later E-0235, G-ADNO)
E.8. = D.H.84A Tiger Moth (RAF DF203, D-EDAS, OY-DGH)
E.8 == D.H.94 Moth Minor
E.8. = D.H.80A Puss Moth (later G-ACYT, RAF ES920)
E.9. = D.H.84 Dragon prototype (later G-ACAN)
E.10 = D.H.82A Tiger Moth (RAF T6746, D-EDAM)
E.10 = D.H.82A Tiger Moth (RAF DF131, D-EDEN)
E.10 = D.H.83 Fox Moth (later G-ACRK, VH-UBB)
E.10 = D.H.95 Flamingo (RAF R2765)
E.11 = D.H.84 Tiger Moth III, DH Gipsy Major IIA
E.12 = D.H.82A Tiger Moth (RAF DE459, D-EDIM, D-EHYB, N459DE)
E.13 = D.H.82A Tiger Moth (RAF DE153, D-EDOM, OY-DYJ, D-EBKT)
E.14 = D.H.82A Tiger Moth (RAF NL971, D-EDEM, PH-III)
E.14 = D.H.94 Moth Minor (later G-AGAO, VT-AMG)
E.15 = (??)
E.16 = D.H.82A Tiger Moth (RAF DE970, G-AOBJ, D-EBIG, N10RM, G-AOBJ)
E.16 = D.H.95 Flamingo (later G-AGAZ, RAF AE444)
E.17 = D.H.82A Tiger Moth (RAF T6904, G-AOBR, D-EDAR)
E.17 = D.H.95 Flamingo (later G-AFYK)
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E-0222 = D.H.89A Rapide (later G-AKJS)
E-0226 = D.H.94 Moth Minor (ex-E.6)
E-0232 = D.H.93 Don (ex-L2412, propeller tests?)
E-0233 = D.H. ?
E-0234 = D.H.98 Mosquito prototype (later W4050)
E-0235 = TK.2 (DH Technical School) ex-E.3., ex-E.7. (later G-ADNO)
E-0236 = D.H.94 Moth Minor (ex-E.1., later G-AFOJ)