I don't think it's bitsa but a good 1948-1950 VH, the owner must have given the numbers so this is just a test for us.
The motorcycle in the background is a Matchless.

It has the 1929 inspectioncap on the magneto sprocketcase but that could just be the timingdeck.

The frontspring is pulling and it has a rearstand making it end 1929 or early 1930 model F.

A very nice hunter, I rather have a 2 valver, it's a shame they didn't bother to weld the broken fins.

It's the color of the frame, that could be ; blue, red or black in 1953.

It's not a singlespeed but 3 gear-clutch and kickstart, it's missing the half compressionlever but not a bad Ariel.

The frontforks and hub are newer, they took a powerfile over the shaky number.

It says secondhand dept. and 1936 models on the shop window so there could be new last years models in 1937 or it is 1936.

This could be an original even with the small 350 tank, https://www.ebay.co.uk/itm/1936-ARIEL-R ... SwoCdd2p3X

The VHA studs are shorter than 1954-1959, the nuths are differend aswell.
The exhaustpipe is differend also.