if you want to live near WBS, the best place is Cryfield or Cryfield townhouses (if you want ensuite). They are £4840 and £8809 per year respectively for 40 weeks
If you want other options for ensuite, arthur vick is £8087 with a small distance to WBS (but you need to temporarily move out during the term 2 holiday). If you want alternative accommodations that are shared bathrooms, Roots is good for £4305/£4920 per year for 35/40 weeks respectively.
all of them require you to pay in three instalments for each start of the term.