Brought our lab (26kg) from uk - weight is important as used excess baggage with Thai airways in 2019 - did it all ourselves - import permit dragged from Thailand and relo4paws kindly gave animal import a nudge for us - straight forward as long as you plan and book space early on plane as restricted number of pet spaces allocated on each flight - she was there waiting for us after going through passport control π
We arrived with 90day non o - dog import permit does not hv time limit as you say and no such visa for dog. Did you apply for a temporary permit for animal?
Try ACRO website for UK - May give you a guide - gives pdf explaining when certain crimes fall off reporting - I believe this is the site that produces the document foreign governments require for certain roles / visaβs