Been down this road.The normal procedure is to try to make up a new log based on memory of as much as u can,TOTAL HRS,TYPE OFA/C,P1 HRS,P2 HRS,NAMES OF SCHOOLS WHERE TRAINING DONE.Then go to a solicitor and swear an affidavit to the effect that your new log is to the best of your knowledge TRUE TESTAMENT OF PREVIOUS FLYING EXPERIENCE.U then have to go to another solicitor to have him validate it with his signature.Job done.Stick a copy of the sworn affidavit in the back of your new log book[get some extra genuine copys from the sol]make a note in the back of the log book;:THIS IS MY SECOND LOG BOOK,THE FIRST HAVING BEEN STOLEN ON BLAH BLAH.Thats it.If u can,go to the school/s where the training was done and make up a copy from there records if they are available to you.Whilst your there ask them to sign the log to the effect that its true.If u cant ,or for some reason the records are not available,dont worry just do as previously stated,from memory with a signed and sworn affidavit is good enough for the CAA.Mine was stolen along with everything else,licence,med,h/set the lot.I had 150hrs at the time,the schools i had trained at had changed from written records to computer and didnt have any of my records,but like i said just remember all of it and u will be ok.Cost of it? ABOUT 150 pounds total.Hope this helps.It does work ok ive just had my proffesional licence issued recently with the said log book sent to them.