Brian Bells book, ’70 Years of Garden Machinery’, has some information. A 10-12cwt capacity model was introduced in 1954 with the single wheel at the front, earlier models had the single wheel at the back. Engine was a 2hp or optional 3 1/2hp BSA. No mention of unladen weight, so it might be a case of putting it on a weighbridge.
Another problem you may have trying to register it for the road is providing a date of manufacture. The FBHVC newsletter contains articles about registering vehicles archive of newsletters