Do you tip for a taxi ?

[AllThatAndMore]

My friend is visiting from a country that tips ( also the country I grew up in ) ! She is taking a Gatwick booked taxi to my house ( £75). Would you tip ?

No, never for a booked taxi. Will round up only if paying in cash. E.g fare comes to £8.50 I wouldn't ask for change from a £10 note.