Lemain,
To answer your question about lighting (if you read the post in full you should see it was me who posted your quote).
Do we need structures to be well lit? A resounding YES!
Not for navigation but for collision avoidance purposes. We also need to be able to comply with the 500 foot rule, so objects like crane jibs should be better lit than they presently seem to be in London. Maybe the ones over 500 feet high (or less, where helicopters are required to operate at below 1,000 feet) should be given special consideration with regard to being made more visible, for the safety of everyone.
Helicopters operating in the LHR and or City zones, in order to operate to and from London Heliport (Battersea), a VFR only location are required to be flown under SVFR / VFR as appropriate. This involves the principle of see and avoid. If you can't see, it's possible you won't avoid, irrespective of how good your navigation kit is.