BT to pay £22m in interest to rivals in ethernet overcharging case

We're talking about the overcharging up to 11 years ago. An interest rate of just 3% amounts to roughly 34% over 10 years.

Re: Where's my cut?

You weren't overcharged. You agreed to a price and contract and paid it to those third-parties.

Any refund would have come from those companies direct because your contract would have guaranteed it and was much more clear-cut. Or you had no refund owing whatsoever.

This is those companies recouping anything they may have had to refund you (likely zero given most of the guarantees on those circuits) and the interest on them being out of pocket during that time based on their contract. Not you recouping from them based on yours.

As always, your contract is with the company who supplied you, not the underlying contractor they choose to use. Otherwise you'd be in a whole heap of trouble because no end of shouting would ever fix your problems and they'd just tell you "talk to BT, nothing to do with us, oh by the way you owe us this month's payment".