Accepting a counter-offer

I have a vague recollection that its between 50-66% (but can't locate the source of that at the moment) - so very high - fundamentally the issues that drove them to look elsewhere in first place often remain. A few extra £ doesn't change that unless the counter offer fundamentally changes the role/reporting lines etc.

And of course some organisations counter offer but know the person is disengaged so use the time to look elsewhere and then exit the person eventually anyway.

You may not find an accurate source I am afraid - most of the data comes from the recruitment industry who have an interest in exaggerating the figure (as they get paid when people move not when they stay. There are higher figures quoted in the states.

A quick google comes up with the attached article from the telegraph quoting 66% but again its from a recruitment agency.