Wireless Network Dongle
Wireless network dongle is a very common name for wireless modem or adapter. You just need to plug into the USB port to get connected to the internet.
There are many types of wireless network dongles available in UK these days. You can also get a wireless network dongle for free when you sign up for a contract with any networks in UK, that offer contracts for wireless network USB dongle internet connection.
If you do not like to attach to a contract, you can consider buying the wireless network dongle and subscribe to pay as you go mobile internet plans