Depends on the age of the seat. The early ones from the 50's could mess you up (still better than perishing in a ball of flame though) but modern seats shouldn't produce any damage at all. The HArrier has a Mk 12 which is late 70s/early 80s vintage.
I'd echo the comments re: awaiting the board of inquiry.
But - if you want an aircraft with even worse gliding characteristics - look no further than the Lightning! Key difference being that the operating altitude of our double Avon equipped piece of 1950's technology (still classified max ceiling (?), multiple time to altitude records, alleged shoot down ability of all sorts of high altitude USAAF exotica) is rather different from the Harriers, who are the guys scaring the sheep down at @200m and below. How much time does that give the pilot when things go wrong?