A UK label which pressed many (if not all) of it's releases in Ireland.
Indigo and Indigo Sound were the in-house labels of Indigo Sound Studios
in Manchester. The studio was owned by Dave Kent-Watson whose
background was in sound engineering (he'd worked for the local ITV station Granada).
Many famous Manchester indie releases were recorded at Indigo, the Buzzcocks "Spiral Scratch" EP for one.
Indigo Records appears to have been reserved for pop and soul while Indigo Sound releases appear to consist of folk acts for the most part. I say 'appears' as I haven't seen enough records to be sure of these conclusions and there are exceptions.
Many of these records were pressed in Ireland by EMI which results in them being mistakenly described as Irish, e.g. Guggenheim's sought after LP. The Cave of Living Streams LP exists both with and without the Indigo logo.
Singles GOPOP Series GOPOP 1 Peter Adamson - Tudor Family Tree / Moving On Backwards  GOPOP 2 GOPOP 3¹ The Improvisors - Loch Ness Nessie / Christmas Won't Be Long  (PS) GOPOP 4 GOPOP 5¹ Pat Phoenix & Peter Adamson - The Two Of Us  GOPOP 6¹ The Jeffersons - I Will Never (Stop Loving You) / Rosetta  GOPOP 7¹ Salena Jones - Live And Let Die / Some Other World  (PS) GOPOP 8 GOPOP 9 GOPOP 10 GOPOP 11 Syndicate/Manchester City Football Team - Me Ball's Burst/Up The Blues  (PS) GOPOP ?? Salena Jones - Live And Let Die Albums GOLP-7000 Series GOLP 7001 Guggenheim - s/t  GOLP 7002 GOLP 7003 Royal Corps Of Signals Band - Spirit Of England  GOLP 7004 The Improvisors - You'll Find A Welcome Round At Our House GOLP 7005 Pete Sullivan - Memories Of Pete Sullivan AKA All Time Favourites on Moog  GOLP 7006 David Hamilton - Streets of London Mixed Releases The IDS-/IRS-5000 Series IRS 5053 The Lewis Goodman Explosion - Funny Lovin' Man / Memphis Train 7" (Indigo Sound Studios label) IRS 5181¹ Dave Blakeley - s/t LP  IRS 5124¹ Therapy - One Night Stand LP  IDS 5422¹ Kevin Neill - Harry Lime Theme / Black Eyes 7"  IRS 5510 Sharon People - Inside Looking Out  IDS 5567 Cave of Living Streams - Sixteen Songs LP IDS 52809 Orphan - Reasons For Seasons / Bad Loser 7" (PS)  IDS 52898 The Three Crows - Live At Tameside Theatre LP SLCW1031 Presence (UK folk group) - s/t  ¹ = manufactured in Ireland (by EMI)