Douglas was still using the chromium plated tank and tartan panel in 1932. This tank has probably been refinished, as well as the original rear mudguard has been replaced with a different pattern and parcel carrier is gone and replaced with a pillion pad. I really do not know of any difference between the 1931 A31 model, and the A32, or otherwise known as the Terrier of the following year. It could be either.
There was a similar B32 model (in 1932) for the colonial market, it had a slightly larger capacity petrol tank and a sturdier pattern parcel carrier. From the shape of the petrol tank, it does not seem to be one of those.