Why is the internet more expensive in Spain than in Britain?

The Internet has become an essential tool for our lives, perhaps as much as the light. Everyone is trying to keep up with the digital revolution and keep up with the advances. One revealing aspect of the internet is the mobile phone, today the mobile phone is a device that has become indispensable in our lives, so that 67% of the world's population has a mobile phone so that they do not feel isolated from society.
The utilities of the internet-mobile couple are increasing more and more facilitating tasks of our daily life, but we cannot forget that this tool has its prices and we have to pay its expenses whether we want to or not.  However, the prices are not the same depending on where in the world you are.
Having just moved from Spain to Great Britain, I knew beforehand that the prices of various goods and services would be higher compared to Spain, as companies usually make their business decisions depending on the nature of the market and purchasing power.
However, I was surprised by the fact that internet rates, whether for Wifi or mobile, are much more expensive than in Britain. For example, unlimited internet for mobile is 27 euros in Britain while in Spain it is almost double 50 euros.