Your search for "RIO (UK)" revealed the following:

MARCIA GRIFFITHS / SOUL BROS [Mr Everything / T.n.t.]

SOLD OUT

ID No. 241143 Label RIO (UK) Production Studio1-60 Genre [A] Ballad [B] Ska / Female Vocal Inst Condition EX Soundclip* Good Condition.

BROOK BROTHERS [I'm Free/ How Many Time]

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ID No. 223491 Label RIO (UK) Production Genre / Condition VG Soundclip* 斜め傷によるポップノイズ目立ちます。

LLOYD CLARKE [Love Me / Half As Much]

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ID No. 180929 Label RIO (UK) Production JA Genre [A] Ballad [B] Ska / Male Vocal Condition VG+ Soundclip* 「Thril Me 」キラー・バラード

THE RULERS [Wrong Emboyo/ Why Don't You Change]

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ID No. 236639 Label RIO (UK) Production UK Genre Rock Steady / Male Vocal Group Vocal Condition VG+ Soundclip* The Clashがカヴァーした歌。

THE RULERS [Don't Be A Rude Boy / Be Good]

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ID No. 237799 Label RIO (UK) Production Sir JJ Genre [A] Rock Steady [B] Ballad / [A] Group Vocal [B] Group Vocal Condition VG(LD) Soundclip* Carl Dawkins

BROOKS BROTHERSHOW MANY TIME [I'm Free / How Many Times]

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ID No. 227544 Label RIO (UK) Production King Edwards Genre Ska / Male Vocal Condition VG(WOL) Soundclip* ブルースバスターズより少し優しい感じの男性デュオスカボーカル。

VIC BROWN COMBO [Swanee River / Robert E. Lee]

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ID No. 240612 Label RIO (UK) Production JA Genre Ska / Inst Condition VG+/VG(SOT) Soundclip* 63 Jamaican Shuffle Inst.

ALAN MARTIN [Shirley I Ove You / Why Must I Cry]

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ID No. 222588 Label RIO (UK) Production Genre / Condition VG Soundclip* いい感じのロッカバラッド。