Half the fun is the gap between what you expect and who actually shows up. The United Kingdom anchors this page, but Northern Europe is a big place, and Norway and Finland are part of the same pool of strangers waiting to connect.
You will not need a translation app for the United Kingdom. English is the working language, and the only real adjustment is tuning your ear to an unfamiliar accent for the first minute or two.
The United Kingdom sits at UTC. That means 10pm there lines up with 11pm in Berlin and 2am in Dubai, so a little timing turns a quiet queue into a busy one.
Nothing at all. Random matching, video, voice and text are open to everyone in the United Kingdom, whether the conversation runs in English or English, and there is no trial that expires or premium tier holding back the useful parts.
Signing up is not part of it. Anyone in the United Kingdom can open the page and chat anonymously in English or English; the age confirmation is the only box to tick, and nothing you type becomes an account.
Chats from the United Kingdom run in English from the first line, which makes this an easy place to start if you would rather not handle a language barrier and a stranger at the same time. Evenings there — 10pm at UTC — are when those chats run longest.
Around 10pm in the United Kingdom, which is UTC. From Berlin that means 11pm, and from Dubai, 2am. Earlier in their day you will still get matches, just fewer from that part of Northern Europe.