This 7-digit catalogue number is in Philips/Phonogram's format, so definitely not a UK issue, as that company never had the UK rights to MCA/Uni; this number was used in France, Spain, and The Netherlands, and the label images here match The Netherlands issue in Discogs.
it seems to be the dutch (or possibly the french? but no "sacem") release: the uk cat# was UNLS 108.
(it may well've seen a new uk cat# in 1974 when emi took over the uk (etc?) licence for & distribution of all mca group records, but yr hmbl srppnt. doesn't know what this will've been.)
(the apostrophe's in the correct place, as ian matthews' name ends in "...ws"; it could be argued that there ought to be another s, as in "matthews's", but there ain't. . .)
and yes, it was released as an ian matthews solo album, and it was the success of his solo single covering "woodstock" as by matthews(') southern comfort, that led to the formation of the permanent group/band taking its name from the single and this lp. . .
(- it also led to philips/vertigo dropping his third solo lp for them, "journeys to gospel oak", which had been scheduled for release in 1973; this eventually appeared a further year on, from mooncrest in 1974.)
I think technically this was an Ian Matthews solo album, although nowhere on the record does it actually suggest that. Only Gordon Huntley from these sessions went on to be a member of the group Matthews Southern Comfort (note lack of apostrophe) that made the two albums following this release. The single from the album, Colorado Springs Eternal, was credited to Matthews' Southern Comfort however (with the apostrophe). I believe by the time they got to Woodstock, Matthews Southern Comfort was a fully fledged band.
These labels look Dutch to me and have the apostrophe in the wrong place. Also, pseudonym or not, shouldn't the composer credits match what's printed on the record?
this is an undated reissue - the original release has a uni uk alpha prefix/part to its alphanumerical cat#.
(yr hmbl srppint.a also recalls - i trust, correctly - that the woodstock single & the matthews southern comfort lp were originally released as a solo single & a solo lp by ian matthews, and the group/band of the same name as his solo album was put together after that - yr hmbl srppnt.'ll have to dig out the original uk release of the lp that's buried upstairs, to check this. . .)