Okay kiddo, let me try to explain this to you in a way that is easy to understand. Have you ever heard of the government? It's like a group of people who make rules and decisions for a whole bunch of other people.
Now, there's a country called Wales, and they have their own government. In 2006, the government of Wales made a law called the Government of Wales Act. This law talks about how things should work in Wales, and one part of it is Schedule 5.
Schedule 5 is like a list of things that the Welsh government can't do on its own. These things are important and they affect a lot of people, so the Welsh government has to ask for permission from the UK government before they can make any decisions about them.
For example, one thing on the list is "defence". This means that if Wales wants to make any decisions about things like the army or the navy, they have to ask the UK government for permission first.
Another thing on the list is "foreign affairs". This means that if Wales wants to make any decisions about things like trade with other countries or having ambassadors, they have to ask the UK government for permission first.
So, Schedule 5 is basically a list of things that the Welsh government needs to check with the UK government about before they can make any decisions. It's there to make sure that Wales is still part of the UK and following its laws, even though they have their own government.
Does that make sense, kiddo?