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"Burn Baby Burn" is a non-album track as far as the UK and Europe is concerned. It appeared on the US/Canadian editions of Nickelodeon (which came out in early '74), replacing "Solitude". It also was issued on CD on the UK version of Halcyon Days.
UK promo release
The release date is believed to have been 16 Feb rather than the 19 Jan date on the promo release.
There are many variant printings of "Burn Baby Burn" - some are marked printed in Holland, some marked printed in England, others with no information, all with the normal AMS 7XXX UK numbering format, rather than the European-style XXXXX AT numbering. It looks as though UK and Holland may both have issued the single as a picture sleeve (which has the UK numbering) and some singles sold in UK may have been printed in Holland.
There are two UK release labels - not known which was the original and which the reprint, though the picture cover release (whose labels match the promo) is likely to have been the original.
UK variant release
Different typography and "Made in England" at the bottom of each label. A copy of this exists with the variant side 1 and the standard side 2. Maybe they had excess quantities of one side's labels whe they commissioneda reprint.
Interesting release - the brown label design looks a bit like an Australian or NZ release (like the brown label release of Hero And Heroine, which is thought to be a Scandinavian release. The A&M "plate" sleeve confirms it with the legend "(P) 1972 A&M Records Inc. Distributed in Sandinavia and Finland by the Sonet Group". (1972 may refer to the sleeve or this may have come from an older 45, as the record clearly has a 1974 date.) So it looks like Sonet, which had indepedently released Strawbs albums from the very beginning, was no longer doing so by late 1973/early 1974, but were acting merely as a distributor for A&M thereafter.
German promo release
Not a particularly attractive promo sleeve, the actual release sleeve is much nicer. Both have the same single inside.
(The Dutch single has the same numbering at the UK single - see note above)
Nice picture sleeve (same as the front cover of the German release), identical on both sides except for tiny printing on the back running along the right hand border indicating the manufacturer.
South African release (*)
New Zealand release