Is the £50 after bills, including food? If so, that's no different to a lot of folk.
If it is £50 before bills, then you would probably qualify for Housing Benefit.
You would think so but I am in the situation of being unemployed & signed off at present & I share my council house with my adult child (though they are not on the lease, it is their childhood home) who works full time in a minimum wage job. Housing benefit is assessed on your gross household income & we in our particular situation do not qualify for any reduction in rent. However we do get a similar council tax reduction as single occupancy households get. Ofcourse water rates are still applicable as they are to all.