Read the above link and see how they lock you in to an unfavourable situation. You must be aware of the kind of lockin. You wont know what you will be doing in a years time. For some people there is no doubt its a good thing. But the rent and charges should not be going up IMO. If you were renting straight you would move out !
It may sound crazy but buy a small house near a student catchment area and live yourself in rented property. You will have a smaller mortgage and be getting some equity at least. This is a similar idea as shared ownership – the big downer is you dont live in your property. But strictly speaking you dont own the shared ownership one either. At least with a small student house you may be owning the freehold as well.