This has been bothering me for several years since my first visit to the Lavenham Guild Hall.

I would love to find some documentation that indicates the original verse/lyric to be Lavenham blue instead of lavender blue.

Lavenham, Suffolk, England was the centre for blue dyed broadcloth, called Lavenham Blue, much sought after throughout medieval Europe. Sadly I can find nothing. But wouldn't it be wonderful?