What is the name given to the trunk route of the English canal that links London to Birmingham?

I live on in! My boat's not in the picture though 😕 🙂

I live in Milton Keynes the canel is great to walk

I live in Aylesbury so had to get this right

I used to live in the part of London where it begins.

it's a pleasure to see it's been brought back to its former glory !! it almost became an open sewer in the fifty's and sixths