I'm 6'1" and have plenty of headroom. No worries.
Had concerns that I would be feeling claustrophobic but it's also a nice wide cabin with plenty of legroom too.
Make certain you've got the seats all the way down . . . . the manual seats drop a Loooooonnnnggg way :lol: (Had them in my 2 litre). Electric seats don't drop quite so far but it still makes a big difference.