I do not see why a german Telefunken issue has been choosen as Master release for this LP when french ASTREE was indeed the first on the market . As far as I know ,French astree with original pressings was a much better choice .
RSG §16.4: Try to select the Key release that best represents the title and image for all the releases in the Master release, with the title taking priority.
If you have a good reason change the key release.
The Bottom line is : is U.K pressing made by DECCA the first issue ( due to lack of original french Pressings at inception) ? However , first pressings have ASTREE labels , gatefold has a single letter code price . Blue labels with Silver letterings .