Did love that brilliant moment with Roy, pulling up the zip on his anarok. As has been said, it is almost worth suffering the dross of the rest of the programme for that wonderful moment.
Yes, I do agree they are trying to show via Max how radicilasation takes place. Max is very hinged on the fact that he was not allowed back into his old school (as the result of his own behavior), but he sees HIS place being taken by a refugee lad. On such things people really do go along this sort of route. "They" have taken my job, house, etc. etc.........
Do wonder if this story is just a little too subtle to make any impression on those who follow down this racist, anti immigrant path - but it is a good try by the scriptwriters.