So I recently failed an MOT (UK) because my rear fog conversion switch didn't Illuminate /sigh. I have since taken apart the switch, swapped the switched side of bulb wire on to the sidelight feed so it lights up when pressed now, instead of just all the time.

Hay presto it works.... But only with a bulb borrowed from the other switch 🥲.

TLDR I can't find replacement bulbs to save my life for these switches. Can anyone help please 🙏