Hi there,
You can find potential flatmates/housemates or available rooms on numerous websites. For example, Ideal Flatmate, SpareRoom or Roomies.co.uk.
Furthermore, there are multiple Facebook groups where people constanly look for housemates or available spaces. I would recommend you to join as many as possible to get to know your options and choose the best one.
Lastly, sometimes universities help their students find private accommodation and select flatmates to live with. You can ask your university if they offer such services.
I hope I managed to help!
Best of luck,
Melanie
LSBU Rep