That’s not quite the case, don’t believe everything you read on Wiki, the IBA had a much firmer grip on things, approved all the programme schedules for starters, and could even comment on the companies’board of directors to an extent I think?
Regulator is the wrong word to describe them really
They were very close to being a publisher broadcaster.
The 1963 Television Act makes it quite clear that " .. the authority obtains its programmes through contracts with programme companies which derive their income from advertisements ..". I can't see the IBA pouring petrol on the flames of an already incendiary situation.
I haven't had time to comb through this act for details but were there any particular sections that covered large scale industrial action within ITV companies / programme contractors, and what the IBA could and couldn't do in such situations order to provide a service as they were the broadcaster?
Would have been difficult and expensive to get the signal from Jersey to the mainland. Back then it would have required rigging a microwave link into France, and then injecting that into the Eurovision network. What have cost a fortune, and you might have come up against French union resistance ( or perhaps not !)
CTV and the IBA could have played it imaginatively in a smart way if they wanted to. Set up a temporary CTV studio and playout centre somewhere on the mainland with an output that feeds into the entire ITV network all the way to the local transmitters, then beams CTV to the Channel Islands via Stockland Hill.
Considering that most CTV material broadcast during the ITV strike was pre-recorded then this would have been quite easy to implement in practice.