I've managed to track down the above photo,which comes from the 1970 Chad Valley Catalogue.

Whilst the description makes it seem they were the only ones produced,I think there are a couple of reasons to believe they weren't :-
1) an omission like Constable Knapweed
and 2) the conspicuous absence of the word "New !" which usually trumpets any new range.
But we'll need to get hold of the 1968 & 69 catalogues to find out.

The only survivor I've ever seen is this Sir Basil. (pic courtesy of Dawn Foster-Denham)
But that'll be down to the very high mortality rate of something as vulnerable as a glove puppet in young hands,rather than poor sales.Although we won't get a true idea of their popularity until we can find out when they were discontinued.

Apart from some hair loss,he looks to have come through remarkably unscathed -even retaining his monocle,which has to rate as some kind of minor miracle -assuming it's the original.
     The Herbs and The Adventures of Parsley   Classic BBC kid's animation by Michael Bond
On this page ..... a set of glove puppets produced by Chad Valley in 1970,and possibly even earlier.
Dawn informs me that it has a label saying "Hygenic Toys,made in England by the Chad Valley Co. Limited".
Although I'm not sure how "hygenic" it probably was as the back of the jacket is sewn-up rather than held on with popper fastenings,so removing it for a wash would've been interesting.And it doesn't seem like the front ever had any buttons either,which is also a little odd,if only from an aesthetic point of view.
No copyright date either,which is a pity.
But a really colourful item though,which kids probably had a lot of fun with,whilst also learning about the effects of excessive alchohol consumption ! And let's hope they got to see his friends too,because I think it's unlikely we ever will.