Originally Posted by
benberg2013
Is there any way to add pages to an existing UK passport?
No. You'll have to get a new one.
Originally Posted by
benberg2013
And if I must get a new passport, will i have to give in my old one for them to keep, or could I keep my old passport with all the stamps in?
You can always ask to keep it. That has worked so far for me (I don't have a UK passport though). Usually they delete it from their database of valid passports and physically destroy the chip and the machine readable part of the passport.