What original stamps and signatures do you need?
The stamps and signatures for the initial grant of your PPL have already been "verified" when you submitted your log book to the CAA. The twice yearly review is signed off on a seperate sheet and the form will have been sent to the CAA by your "examiner" - and they will have a record anyway - I cant think of any signatures in a PPLs log book which mean a great deal these days other than perhaps a sign off that you have had a flight with an instructor at some time in the last two years - in whcih case the instructor will have a note and can presumably sign off the copy again.
Strictly, do you have to swear a copy is a true copy of the original - I dont know but since you can keep a computerised record I guess not.