In England in 2015, Cameron had 40.9% apparently (https://www.statista.com/statistics/717022/general-elections...). The point still stands—he had far more than 40.9% of English seats!

On the other hand, the Turkish electoral system can fail even more bizarrely than a simple single-member constituency FPTP system—in 2002, only the CHP and AKP cleared the 10% threshold, so the AKP had ⅔ of the votes.

However, at the moment, the president is directly elected, so anything <50% wouldn’t suffice. (How those votes are obtained, of course, is another matter.)