United was a BBC2 documentary about Sheffield United which was shown in April and May 1990.
In Sean Bean: The Biography, Laura Jackson writes: "On 27 January (Sean) had recorded the narration for a BBC2 series called United about Sheffield United, that would be screened in five consecutive episodes over April and May." (p.67)
The United series (as transmitted) was actually six episodes long. The segments are:
However Sean's voice cannot be heard during any of the episodes.
Kevin Cookson, in charge of publicity for
SUFC, has confirmed that Sean didn't narrate the series, and that
he's unaware of any other United videos Sean might have narrated.