Just a quick one.when I renew my British passport from Bangkok, am I still allowed to travel?
I think not as your passport is cancelled even though you still have your original passport you can't use it ?
TLDR : Answer Summary
Once you submit your application for a new British passport at VFS Global in Bangkok, you are not allowed to travel internationally. Your original passport will be cancelled during the renewal process, which confirms your inability to use it for travel.