One electrics bulkhead conversion

I first bought this from a local car boot 3 years ago. It was 28w 2D, running on HF gear. I got it home, discovered the 2D lamp was knackered, and the ballast was on its way out. Seeing as I had a spare circline ballast lying about, i decided to convert the bulkhead to circline. It was originally T9 when I first completed it, but in more recent times I made it T5, meaning the lamps profile is much less visible behind the opal cover. I have a matching clear prismatic example which is soon to receive circline treatment.