Further to my posting yesterday, below is a photo of two of my deckhead lights, the one on the right has the original FAWO light switch, while the one on the left has a replacement switch obtained from Maplin. As you can see there is a slight difference in appearance, but not a lot.
Note, for unknown reasons the photos have turned upside down in the posting, but when opened they appear the right way around (at least they do on my iPad !!). If in doubt the fitting with the original FAWO switch is the one with the yellow LEDs, while in the photo showing the reverse of the lights, the FAWO switch is the one with the white switch body.