When to tip and when not to tip

Getty ImagesIt's the end of a meal out and you've been presented with the bill. Suddenly the pleasure of the food you've just eaten is replaced by a faint wave of anxiety as you realise you've got to work out how much to tip.If you tip too little will you face the wrath of the waiting staff? Will you end up tipping too much? And if the service was bad, should you tip at all?The debate is not restricted to…