Here are some scans of the 4AD parts diagrams., they are quite large and can take a while to download. I left them full size so they can printed full size and not lose print quality. And here is a PDF copy of the Motor Trader article, this should be with every 4AD. ( requires, Adobe Acrobat Reader which is FREE)

Serial No. location -- Right side of bulkhead under bonnet.
Engine No. location -- Right side of cylinder block flywheel housing

engine : Four cylinder, 73 mm. by 89.4 mm. = 1,497 c.c.
                       :in 2.874 X 3.52 cu in. = 91.36Overhead camshaftCompression ratio 7:1RAC rated 13 hpMaximum power 48 b.h.p. @ 4,200 r.p.m.Max Torque 72 lb/ft at 2200 r.p.m.Single Solex F.A.I. downdraft carburatorIgnition Q.12. Lucas coil service No. 45020A

Gearbox and TransmissionFour speed gear box with ratios 4.875, 6.12, 9.45 and
       14.53 to 1. Reverse 14.53:1Synchromesh on second, third and fourth gearsHardy-Spicer open propeller shaftSpiral bevel final drive

Wheels and Brakes16 inch bolt on steel disc wheels5.00 X 16 inchGirling hydro-mechanical brakes with 9 in drums

SteeringBurman high efficiency

SuspensionFront independent coil springs and wishbone, rear semi-elliptic leafFront Armstrong telescopic shock absorbersRear Armstrong direct acting hydraulic shock absorbers

Main DimensionsWheelbase 7 ft. 7 ins.Track 3ft 10 3/4 inOverall length 12 ft 9 inWidth 4 ft 10 inHeight 4 ft 10 1/2 inTurning circle 33 ftGround clearance 6 1/2 inWeight 15 1/2 cwt

Price
Initially for export only. £519 15s plus £217 13s 9d purchase tax