I made many friends with other immigrants from all over Europe. This suggested that the English were somehow uniquely challenging to befriend.
What I realized later in life is that this couldn't be further from the truth. The actual situation is that when you move to another country as an adult, most people your age already have established friendships from school and earlier life. They don't "need" a friend as much as you do. This applies to every country. The reason I got along so well with other immigrants was that they also "needed" to make friends, as their childhood friends were all left back home.
I'm not saying this to invalidate what the original poster was saying, but it's definitely something to keep in mind when you move abroad - it will be HARD to make true local friends and you will have to work for it.