If it's over Xmas I'd want £500/day.
Anything less wouldn't be worth it, to me.
Sounds mercenary, but if I'm on call over Christmas it needs to be [i]fucking[\i] worth it.
Gone but not forgotten:
325i M Sport (E92), Black Sapphire, Coral Red Dakota, 19" 225's, Seat Heating, 6FL and de-badge
Replaced by 6.2 litres of AMG powered C class.