Ironically, that's a situation that having a footway alongside a cycle track makes more difficult: parking on a cycle track is an offence, as is driving on a cycle track or a footway, but parking on a footway is not itself illegal, plus the availability of a cycle track alongside that people could walk on makes it difficult to make the usual footway obstruction complaint. They almost certainly drove on both, but it's hard to get it acted upon when no officer saw them doing it.
Are there parking restrictions on that footway, have they designated the entire thing as cycle track (and the visual differentiation is just encouragement) so that parking is an offence itself, or is this another demonstration of the absurdity of the current laws?