First, you will have to register at one of the popular resources. You do not need to provide documents or give your name. Just enter your email address and create a password. There a letter will come, with a link to activation.
After that, you can buy a cryptocurrency, UK gives you more freedom to choose special exchanges. Do not worry about security, trading sites give several levels of account protection. In addition to the password, they offer:
The most popular platforms work with a large number of cryptocurrencies, among which there are always Bitcoin, Ether, Bitcoin Cash. Other sets are also possible, more or less extensive.
How to buy cryptocurrency on a particular resource, the detailed instructions will tell. Usually, the transaction process differs slightly. Having done it once, the client can easily cope with this procedure on another platform.