I don't know where you live in UK. Dogs are not allowed on busses where I live. He'd go, no problem, in fact he tried but the driver was less than polite.
So you might want to check that.

We live about a 40 minute train journey into London and we sometimes go there. He would be fine with that. He's fine with most things. But you have to carry them on escalators. He weighs 80 pounds (36kg), maybe more. About half my weight. Carrying him up an escalator....not a cat in hell's chance.........

I could drive but parking is an expensive nightmare. And not everywhere welcomes dogs - even one as gentle as mine.

You might also want to check that with beaches. Not all are dog friendly.

Max doesn't do the destruction. The odd toy will get the treatment if he is bored. But given how much I stroll him and he darts around in the woods and with other dogs, he gets knackered and rests. We were told by a trainer that's what active dogs need.

But I'm retired so I have the opportunity to do that. And it's good for me also. Not just the physical side. It's difficult to be mad as a box of frogs when you have enjoyed stroll in nature with your hairy buddy.