apt - What is the correct address for precise/12.04 restricted, multiverse and universe ppa?

I am running Ubuntu 12.04. When I run sudo apt-get update now I get the following errors at the end:

W: Failed to fetch http://gb.archive.ubuntu.com/ubuntu/dists/precise/universe/binary-amd64/Packages  404  Not Found [IP: 91.189.92.201 80]

W: Failed to fetch http://gb.archive.ubuntu.com/ubuntu/dists/precise/multiverse/binary-amd64/Packages  404  Not Found [IP: 91.189.92.201 80]
W: Failed to fetch http://gb.archive.ubuntu.com/ubuntu/dists/precise/restricted/binary-i386/Packages  404  Not Found [IP: 91.189.92.201 80]
W: Failed to fetch http://gb.archive.ubuntu.com/ubuntu/dists/precise/universe/binary-i386/Packages  404  Not Found [IP: 91.189.92.201 80]
W: Failed to fetch http://gb.archive.ubuntu.com/ubuntu/dists/precise/multiverse/binary-i386/Packages  404  Not Found [IP: 91.189.92.201 80]
E: Some index files failed to download. They have been ignored, or old ones used instead.

I don't know how long this error has been occurring for, but those repositories seem like ones I want and need to have working, so I'd like to fix it. What is the correct address (or an alternate) address to use for these repositories?

Edit

The only entries in my sources.list file which have the host gb.archive.ubuntu.com (The precise-backports entries do not seem to be failing?):

deb http://gb.archive.ubuntu.com/ubuntu/ precise main restricted
deb-src http://gb.archive.ubuntu.com/ubuntu/ precise main restricted
deb http://gb.archive.ubuntu.com/ubuntu/ precise main restricted
deb-src http://gb.archive.ubuntu.com/ubuntu/ precise main restricted
deb http://gb.archive.ubuntu.com/ubuntu/ precise main restricted
deb-src http://gb.archive.ubuntu.com/ubuntu/ precise main restricted
deb http://gb.archive.ubuntu.com/ubuntu/ precise-backports main restricted universe multiverse

deb-src http://gb.archive.ubuntu.com/ubuntu/ precise-backports main restricted universe multiverse

When I navigate to http://gb.archive.ubuntu.com/ubuntu/ubuntu/dists/ in my browser I can see the following folders:

• precise-backports


• precise-proposed


• precise-security


• precise-updates



• precise
  -- main
  -- multiverse
  -- restricted
  -- universe

This makes me think the paths changed and so the entries in my sources.list are badly formatted now, I'm not sure how to change them to be correct though.

Edit 2

The question marked as a duplicate explains how to remove 404'ing repositories, but *this question explicitly asks what the correct address for precise/12.04 restricted, multiverse and universe ppa is or how to get it. I am not clear how either is a duplicate of the other.

The bare minimum in sources.list is:

deb http://us.archive.ubuntu.com/ubuntu/ precise main restricted universe multiverse 
deb-src http://us.archive.ubuntu.com/ubuntu/ precise main restricted universe multiverse

Edit sources.list using:

sudo -H gedit /etc/apt/sources.list

Then run:

sudo apt-get update

You can find more alternative using Ubuntu Source List Generator here