"Rip-Off Britain" means that some things in the UK cost too much! It's like when you go to the store to buy a toy, and you see the same toy for different prices in different places. But in Rip-Off Britain, a lot of things are more expensive than they should be.
For example, some people say that train tickets are too expensive in the UK. That means that people have to pay a lot of money to ride the train even if they just want to go to a nearby place. Another example is when people say that mobile phone plans are too expensive. That means people have to pay more money to call, text, and use the internet on their phones, even if they don't use it that much.
People don't like paying more money than they have to. They want things to be fair and affordable. So, "Rip-Off Britain" is when things are too expensive and unfair for people living in the UK!