Sunny82z
I think you will still need the old blue pets passport to get back into the UK having had the tick/ work treatment in France.
No you don’t need your old passport as many dog owners wouldn’t have one now anyway. You either need an AHC or a European Blue Passport. The AHC needs to be signed, stamped, dated and timed by a European vet at the bottom of page 4 for the tapeworm treatment. We came back from France last week with our dog.