On 12 servers with real players from the Steam list. Checked 23:24 UTC.
This page counts CS 1.6 servers from the Steam list that stand in the United Kingdom, by the IP address of the machine. It is the location of the server, not of its players: many communities rent machines in another country, often in Germany or France, where hosting is cheap and the ping is fine for half of Europe. Servers that only show up on their own non-Steam master lists, and there are many of them in Brazil and in the Russian-speaking world, are not in the Steam list and not counted here. And the time of day matters a lot: in the morning a country can have a few dozen players, in the evening hundreds.
Over the last 30 days servers in the United Kingdom had 172 real players at any moment on average - 3.2% of everyone on CS 1.6 Steam servers, #8 of 76 countries. Right now 142 people play on 12 servers there, mostly deathmatch and classic. The maps with the most players at the moment: de_dust2, cs_1337_assault, mini_dust2. The busiest time is Tuesday around 20:00 UTC, the quietest Monday around 08:00 UTC.
185.206.151.185:2705026/32Real players185.206.151.185:2705122/32Real players185.206.151.185:2705522/32Real players195.60.166.224:2737420/32Real players185.206.151.185:2706015/32Real players51.77.122.45:2701514/32Real players185.16.40.90:270159/32Real players51.89.12.164:270156/32Real players185.206.151.185:270523/32Real players195.60.166.224:274803/32Real players54.37.207.209:270151/32Real players144.91.118.192:270151/32Real playersRight now 142, on 12 servers. Over the last 30 days it was 172 on average at any moment. This counts servers that stand in the United Kingdom, wherever their players live.
By real players right now: -=AvJeux # DeathMatch Dust2 24/7=- (26 players), -=AvJeux # DeathMatch Assault 24/7=- (22 players), -=AvJeux # DM-FUN=- SINCE 2006 (22 players). The full list is below.
On Tuesday around 20:00 UTC. The grid above shows every hour of the week in your own time zone.