I assume that you did the obvious web search and found Wales & Edwards, which was acquired by Smith in 1989, so this was presumably one of the last built under their original name.
Most W&E milk floats are more nicely styled than this vehicle - it must have been a less common model, perhaps smaller than the standard, or not intended for road use. In later years, milk floats vanished and the manufacturers pursued other applications. In a few minutes of web searching, I couldn't find another one that looks like this, but the name plate certainly suggests that it is a Wales & Edwards.
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