BBC 1 Midlands opted out with our quickly assembled OB, and we were parked up next to a Central TV truck in middle of the happy mayhem.
I can't imagine that being able to opt out of network on a Sunday afternoon for a few hours would even be possible today based on the comments here? Certainly not for anything like a football victory parade - although a team in the Midlands doing well does require celebration as it is such a rare event!
I suspect the fact that ITV regions wouldn't do it either now is a large factor in why BBC regions wouldn't.
Partly, though I doubt any ITV 'region' today has the resources to produce such a thing anyway. They'd probably have to have an OB provider on 'a retainer' and one that is reasonably local. The BBC would struggle for the same reasons, the only exception might be to have one of the BBC 'nations' OBs on standby for them, but I bet these days it's different cost centres and all that.....?
One of the reasons it may have happened at the time was Pebble Mill was a Network Production Centre, and therefore had its own OB crews. Possibly as we were all paid with a weekly timesheet, the rest of that week was quiet (likely with the OB action at Wembley for the weekend staffed by London Tel OBs) - and so it was cheap to do?
Facilities were owned by the BBC, crew wouldn't be into overtime, so the cost was just the diesel to Coventry (and Bardon Hill for the midpoint!).
Facilities in the Midlands are now sadly very much diminished for broadcasting, whether BBC, ITV or ILR.