This page shows public proxy servers with IP addresses detected in the United Kingdom. The UK list can contain entries from several cities and networks, so it is worth using the table instead of copying the first visible proxy.
If you want to compare the UK with other European locations, open the Europe proxy list.
Start with city and ISP if location matters. A London proxy, a Manchester proxy, and a Coventry proxy may all be UK entries, but they can belong to different networks and behave differently when tested.
Next, check protocol and port. The table may include HTTP, SOCKS4, and SOCKS5 entries. Add each proxy with the same protocol shown in the table, otherwise the connection may fail before the target website is even reached.
For quick testing, use Last Checked and Uptime before Speed. A UK proxy that was checked recently and has better uptime is usually a stronger candidate than an older entry with a high speed value. If one entry fails, test another recent proxy from a different city or ISP.