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To clarify what I said (for Riaz's benefit): The IBA had a legal obligation to ensure that their commercial television system was properly funded and was organised in such a way that it could reliably be provided for the duration of the contract period at no cost to the taxpayer, and that programmes should be produced to a high standard. To do this required them to ensure that commercial contractors were sufficiently attracted by the prospects of profits that they would participate and play according to the IBA rules. The idea of locking the majors out of weekend transmission would clearly play against that brief, and risk not only major players walking away from the system, but also risk the quality of the programmes at weekends. As already pointed out, although STV, TVS, Anglia and TTT made some drama, none were sufficiently funded to produce the quantity of high quality drama, LE, documentary and current affairs programmes that the national audience expected at weekends. And with all due respect, Puffin's Pla(i)ce doesn't really hack it as a network children's programme.
The thing is though, all of what you've said, whilst completely true, is really a tautology.
If someone at the IBA had had the harebrained idea of asking Border and Grampian to make all the weekend's output, that is ultimately what would have happened. Those licencees would have simply ceased to be small regional companies, and would have likely changed hands to where the money actually came from.
Large-scale programming is profitable if critical mass is achieved (and the freedom to produce a number of hours of primetime would provide that critical mass). Essentially LWT's staff would have upped sticks to Carlisle and the system would have adapted.
It wouldn't have been an ideal situation, and it may not have been all that successful, but it's not as if Border would have simply remained as-is and drowned under the weight of their commitments.
It has to be said though that people on this thread are taking things to extremes. I don't think anyone is realistically suggesting that the smallest of the ITV stations would have produced anything significant (although Border were punching well above their weight in the mid 80s). But by the 1980s TVS (and the other 3 or 4 mid-sized companies -- Tyne Tees may or may not be included in this as they were always much smaller than the other middle-ground companies) were quite right to ask for more input into the system, especially as most of them had invested heavily (for their size) anticipating programming opps for Channel 4.