The act of parliament which established ITV was extended in 1960 to cover the Channel Islands so yes, the Channel Islands was just the same as the rest of the ITV network in terms of franchise bids.
Wasn't it an
Order in Council
(ie the Privy Council) that, at least in UK law, extended the ITA's powers to the Channel Islands. The basis must have been some resolution passed in the States of Guernsey and Jersey (the
, being the parliaments of both places.
Presumably, the Privy Council has authority over the Bailiwicks of Guernsey and Jersey because the sovereign authority of the Duke of Normandy (Her Maj) is also the authority behind the Privy Council?
I doubt that a UK Act of Parliament has any authority whatever over the Islands, which is why an Order in Council was used?