"Sources close to Sir Philip confirmed to BBC Radio 4's PM that he received £340,000 plus his legal costs."Home Office boss Philip Rutnam quit his job over what he claimed was "vicious" briefing against him.www.bbc.co.uk
So around 2 years pay.
"The former official was earning more than £150,000 a year as Home Office permanent secretary"
Not exactly an earth shattering amount then, given those figures.
Plus his pension and he is now free to continue working. £340 k of taxpayers money not Patel’s I should add is a significant amount.