Angele
Well-Known Member
I don't think it's normal practice to reduce down to displacement speed at night.
No, but it is normal practice to obey speed limits.
The incident happened near Wandsworth Bridge. Above that bridge there is an 8 knot speed limit. Below the bridge, and through central London, the limit is 12 knots. The BBC article in the OP's link says the boat was travelling "at more than double the 12 knot speed limit".