Car lightbulb 380 (Caversham RG4)

I have one spare car lightbulb (380 21/5W); I've tried seeing which car this can be used in but can't find it on the Halfords website. I bought it for a Ford Fiesta which I no longer have.
https://www.halfords.com/motoring/bulbs/380-p21%2F5w-car-bulbs-halfords-ess...