Though someone might be interested. I think its a 1930 Model B:-
"Ariel VB 550cc side valve; this "black Ariel" is complete but in need of restoration (it was running when parked up many years ago). There is also a sidecar which was fitted to the machine when acquired, again requiring restoration. For sale by informal auction. For more information please telephone before 6pm to 01531 822459."
Theres also a Francis Barnett Stag for sale from the same vendor. Same condition as the Ariel.
Swindon Branch Secretary
Ariels - 1913 TT Model, 20 Roadster, 28 Model D, 30 Model B, 38 VH, 52ish VH
The Offroad Fleet - Fantic 200, Bultaco Pursang, Beta Rev 3