i'm 17 and was booked up for flights on my own this year (dont think i can say the company on here?) - had to book an adults ticket but said in the company info that children had to be at least 16 to travel alone think most uk companies are about the same to be honest but maybe you could have a click about on the website to see if it says anything about flying. I did actually change those flights and now am travelling out with my family but back on my own and everythings fine with that so should be the same for you.
As for hotels I cant see anyone being bothered about ages and things as long as you follow the rules and things - friends from college are both 17 and staying in
marmaris booked a
hotel no problem and last year (aged 16 obviously!

) was staying in a seperate room from my mam and brother and i ended up in a different hotel from them so shouldnt see a problem there either.
But to be on the safe side I would ring up your travel agent or have a look on the websites just to put your mind at rest
(: