Hang on, the plot thickens. I've just noticed the 'Skyline Studios' credit on the rear of the later version of the sleeve, which dates that copy as being from some point in 1975 or slightly later. 1975 was when Plastic Dog Graphics changed their name to Skyline Studios. I'm near certain that the copy I viewed (but didn't buy) on eBay had a 'Plastic Dog Graphics' credit. So that's two versions of the later sleeve design that I'm still looking for, then! (The Skyline Studios partnership was dissolved in 1977, but was probably retained on any later pressing runs, if there were any.)
(As for label colours, curiously, Saydisc almost always repressed LPs on the same colour labels as used on the original release, so the label colour only tells you when the record was first issued [or given a makeover, as in this case] and, unlike other labels, doesn't help in working out date of actual pressing. Have I ever mentioned before that Saydisc can be a bugger to document?)
Hi Fokeman, the later sleeve design is from either late 1970 or early 1971. This is a 'best guess' based on the first known orange label design appearing on 'I'll Dance Till De Sun Breaks Through' (SDL 210), which was issued (probably) 1970 (with an outside chance of early 1971). This looks very much as though Plastic Dog Graphics (Rodney Matthews, world-renowned fantasy artist, and Terry Brace) took the opportunity to spruce up the sleeve designs of those records still on catalogue when they took over graphic design duties in - guess what - either late 1970 or early 1971. None of those still surviving - Terry died back in 2009 - can remember quite when!
There's an even earlier sleeve design as well, which is the generic Saydisc design as used on the earlier Bristol Folks LP, which represents a copy from the first 99 copy pressing run. Your copy, what with still including the Mecolico sticker, probably places it in the first post-99 pressing run batch.
At least one other cover and label exist. I'll add further images tomorrow...
Now done. This older version has a pre-decimalisation mecolico sticker which would place it round about the date of issue. Note also the earlier Meeting House, Frenchay, Bristol address before the move to Badminton, Gloucestershire.