Passport Renewal Help UK

Retired in Khon Kaen Thailand from UK for 2 years now
my passport is in need of renewal

What is the best way of doing this is there an easy way, I doubt it

I dont like the idea of handing my passport back can i keep the old one
As it has all my retirement stamps in

I can go to bangkok if that makes it easier

Any info would be appreciated

Thanks

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