Hi there, I am in the uk too. You can take your puppy out in your garden from day one. You can also take him to visit freinds dogs on their or your property as long as their dogs are fully vaccinated, up to date with them and freindly with puppies. My vet told me it was ok to walk my puppy on the pavement after his first jab as long as it was just on the pavement and not to let him sniff lampposts, don't take him to the dog park or let him in water. That is because there is no parvovirus in our area at the moment though, you would have to ask your vet about your area. We waited till the day he had his seccond jab to walk him but carried him everywhere, took him on car journies. Started puppy classes early as all other puppies were vaccinated and took him to visit vaccinated dogs and cats. Take your puppy on trains, busses, let him meet all sorts of animals like cows, sheep, birds, cats etc carry him if your vet says to, I used a backpack put on my front and put him in there. He was much better in new situations once he was allowed on the floor though.
You can start teaching him how to accept the lead and walk on a loose leash in your home and garden too before you go out. My puppy walked to heal from day one once he was allowed outside bacause of prep work beforehand.
Hope that helps
