Alan was not a group joiner. He had friends in the ex-pat community, like Brian Aherne, but it wasn't a sine qua non for him. Gladys Cooper was a dear friend, but becasue they had worked together in London, not because of being in a group that always hung out together. But he WAS English, after all (at least until 1952) so a lot of people he knew were part of the group. And he DID enjoy cricket, so that sorta forced him to hang out with C. Aubrey Smith.
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He and Gip (who had been an actress herself in England, although she was a dental technician here) would have people over for play readings at their home. Some English, some not, but people was had artistic interests beyond the movies.
Boris Karloff was a friend. Val Lewton - not a Brit - a very good friend. Alan gave the eulogy at his funeral.
Alan just liked people in general, but it was Gip who encouraged him to get out more and mingle.