Biscuit - I will try and go on FB thread when have a minute.
But a bit of reassurance, DS started last year, he never bonded with flatmates (one on his course, never spoke to him, and DH only got a grunt when trying to engage with him in kitchen once) but...
He made friends with people in flat above at very start, and some guys he got talking to on first night from private halls (one on his course) and never looked back. Moved out with 3 from flat above, still v friendly with guys (who didn't join them in house for a specific reason), also has some good friends on his course.
It can take time but they will make friends in end, if not from immediate housemates, then others in block, or on course, or through a hobby. DS went running with a few different guys, then joined a running club, introduced by a girl on his course in year above!