I replaced the under bonnet light on my pre project drive F with an interior
light from a R100, they are the same shape but with a built in switch.
Lost count how many of these I raided from the scrappy from 100's and LDV Mini Busses, it was a popular
mod on the 200/25/ZR boot light, fitted one on every one I have seen, I had them on the bonnet of boot of my
old F too with a 21w bulb, saves the the battery draining too if your faffing about.