Vintage London underground fluorescent fittings

Yesterday saw me go on a little adventure exploring a lot of London by tube - I was surprised how many fluorescents are still in use! Sadly I did not spot any T12 tubes, but some far-flung stations (and possibly Russell Square station) still have a few from what I can remember. Here is a selection of custom fittings (from the 1970's or '80s) used in some tunnels leading to platforms.