I don’t understand how you can have 2 live passports from the same country, surely the old one was cancelled when the new one was issued? In which case trying to travel on it will be a problem.
, no I didn’t. I applied to ‘renew my current passport with no changes’. I had to supply some documents, as listed on the documents required pages. Plus copies of every page of the passport to be replaced.
I can only assume that if you are applying under another section, like changing name etc, then they may want to see it. But, If you are applying the same as I did, and you have your old passport to present (not lost or stolen) then I have no idea why they would ask for it..sorry
I applied though the online web page for applying to replace a UK passport from overseas. Complete the application, gather the supporting docs then apply for an interview through vfs global. They accept it if all is ok and send it to uk. The return takes about 6-8 weeks ( or did in June) and you go and collect your passport. I am in Bangkok so I used the Trendy Building Office. But there are several throughout thailand.
I am pretty sure (although not 100%) that cars in Thailand must be Right Hand Drive… just assuming that because you are coming from Italy that it will be Left Hand Drive.