Oh lil that sounds difficult. So I don't really want to sound wrong and show a lack of political correctness but it sounds difficult to feel like that in your own English speaking country.
As most of you may remember I am an immigrant and English is my second language. We live within M25 but close to boundaries and while there are plenty of immigrants around I could say more than 90% of ladies in baby groups are British - and I always have difficulties to mix in and make close friends, and I think You just explained why... A language and perhaps a cultural barrier. I feel people are not comfortable with me, not as much as other strangers who are British anyhow. But I appreciate the reasons for that...
On the other hand, my nct group has been absolutely fab (again all British) - I've made friends and been to play dates, etc...
I have no other friends with babies around anyhow. I decided on purpose that I will avoid spending loads of time with other friends from my country as I hate to live in a closed circle in the UK, i want to embrace living here...
So I am the other side of the coin Lil, I have been and am trying hard to mix in culturally, and it hasn't been impossible, but it is not easy either... i'll keep at it though. And in general, I think you brits are fab in this...
Sorry - non-baby related post!
Smart trike now ordered. Will report back how useful it is!