Apart from English, which other language are British people most likely to be fluent in?

Obviously being able to count to ten was an example of something that is extremely entry level and not at all a demonstration of fluency. I could have said naming the days of the week, or being able to introduce yourself, and the point would still stand. There's almost certainly not enough first language Welsh speakers in Wales for there to be enough to not mention it on the census that it would affect the results that considerably. Welsh was mandatory from the age of 4 to 16, and yet neither me, any of my friends, family, or anyone I grew up with can speak Welsh fluently. The only person I know who can actually speak Welsh (and not 'oh I know how to say dwi'n hoffi coffi so therefore I can speak Welsh') is because he was raised in the Welsh speaking part of Caenarfon and it was his first language at home. But we've even joked in the past that I did better than him on my GCSE Welsh exam and he thinks it's because he answered in Cofi Welsh and some of the dialect is too different from the expected Welsh of the exam to be considered correct. If every single child in Wales has 12 years of mandatory Welsh lessons and yet nobody can speak it unless they speak it at home as well, then clearly it's not being taught very well at all. If someone argues that it is taught well, then how can they explain only 1/3 of the population being speakers. Combine that with the fact that English is the default language in most of the country and you can reasonably expect to go your whole life without ever having to use it, then why would people actually bother to learn it properly. Half the people I know can't even pronounce town names properly because they're so used to everyone defaulting to an anglicised pronounciation. They'll often still be adamant that they speak welsh though, because if you say they can't then they see it as an attack on their identity as a Welsh person. And that itself makes it even harder for efforts to keep the language going. I would be surprised if the true number of actual Welsh speakers was above 15% of the population. Yes its probably most of that population if you include knowing a couple of words and phrases, but actual fluency where you could get by as normal if English magically disappeared overnight, is much, much rarer. Just because you know how to say the full name of Llanfairpwll, doesn't mean you can speak Welsh. I know that konnichiwa is hello in Japanese, but I sure as hell don't consider myself a Japanese speaker