"Like I said MIF it's a prerequisite and common goal. I did understand. This is not the case with the playgroup, they just enforce the rule NO British."
Yes - but if the REASON for the rule "no British" is "we want a couple of hours a week breathing space from the dominant culture" then I say, forget the law, let them get on with it.
I have spent a lot of time abroad and, though I try to avoid expat communities like the plague, I am very aware of the burden that places on you, not just as a Brit but as a FOREIGNER. The assumption that you share the common values; the assumption that you get the jokes; the assumption that you understand what all the foods on sale in the supermarket are made of; the assumption that the weather is no problem because you have grown up with it; the assumption that you understand the culture and its taboos; the assumption that you watched the same TV programmes as a child ... this is immensely physically and mentally tiring and a saftey valve with others in the same boat would often be a welcome thing. Ironically, the better you are at the language and fitting in, the harder it is, because the assumptions just get more automatic.
And the cost is £5k? Councils spend more than that every week on photocopying. Let them have their fun, I say.