In message , Dave Arquati
writes

Upstream, I don't see how more value can be extracted out of river
services than the current commercial ventures without a massive
subsidy. Beyond Westminster, the riverside area isn't particularly
teeming with demand, as demonstrated by the current limited commercial
services to Chelsea Harbour and not really beyond.

One big disincentive is the speed limit of 8 knots above Wandsworth
Bridge. I suspect there could be some demand from Putney/Hammersmith/
Barnes/Mortlake/Kew if high-speed river services were possible - but
raising the speed limit would need a vast amount of work on riverbanks
and I don't see that happening. Also, most of these places already have
good public transport into central London, so even a high speed river
service might well not prove competitive.

--
Paul Terry