In recent years I've travelled direct to Ireland from France with my dog. It's been very straight forward, I call with a vet in Pontorson, get the worming tablet, get checked in at a French port, get on the ferry, home in Ireland checked again by Irish official at the Irish port, and then I'm on my way home. What is the procedure going via England? Does the one treatment in France cover both Ferries? Is there a time limit driving through England?