Very well lit? It has a single red light on top of the movable jib. Against the backlighting of the capital city, like all the rest of the very many cranes sprouting everywhere in London.
We do have the benefit of operating under night VFR, at least since the national rules were recently changed to allow it, rather than to mandate IFR only at night. But the task remains the same. There never has been a London heliport with an IFR approach.
Corporate helicopters could more safely carry out an ILS at London City Airport, which would be more convenient for most customers. But helicopters have always been banned from operating there.