First Minister Mr Salmond will put the case for Scottish independence and Mr Darling, chairman of Better Together, will argue for the UK to stay together.
The two-hour live debate on STV will be broadcast in front of a 350-strong audience from the Royal Conservatoire of Scotland in Glasgow.
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It is a "televised" debate, but can only be viewed by Freeview viewers (I expect not many valley residents can get freeview (terrestrial digital)) ?! Or it can be viewed online as a live web stream, again, tricky, if not impossible with the average speed of the internet across the valley. But, a heads up to valley residents all the same !