,, 14 month’s ago I was in the Uk on a month’s holiday (been living in Thailand now for 5 years) ,,,, I went to get a new passport in Liverpool as my old passport was full,but still had nearly 7 months remaining on it , they cancelled the old one and cut the corners and gave me a new passport,,, I went into the immigration office in Thailand to renew my visa (marriage)this week and they wanted photocopy’s and information from my OLD passport as well as details from my new passport,,,, even though immigration had transferred all the old details into my new passport when I got back to Thailand over a year ago,,,so DONT throw away your OLD passport ,, hope that helps 👍