When an average 2-bed house costs more to rent in an area you have lived for your entire life (born in that County, lived there forever, all your family there, caring for relatives locally) than your wages, something has to be done though, especially as the Government are no longer prepared to step in to cover the shortfall.
A 2-bed house in the town I live in, that my dc were born in, in the County that I have lived in for 90% of my life (was born in London, parents moved OUT of London in order to be able to afford to buy...) costs £900 pcm, and NMW for 37.5 hrs (FT here) is only £1000 pcm after Tax - something has to give. These people need to pay for their utilities and eat too.
My ideas - Change the Stamp Duty threshold on MAIN RESIDENCE to be on properties over £500K. In the SE, a 2-bed terrace in a good area in the catchment for a semi-decent (good as opposed to outstanding) school can go for £230K.
Make the threshold for stamp duty LOWER on Second homes, around £200K. And no 'flipping' of main residence for Stamp Duty purposes.
Ensure longer private tenancies - but with better regulation, so that a BAD LL who doesn't keep up with repairs can be made to compulsory sell the house (with the sitting tenant) to the Council - for market value, even if that leaves a LL who was a 'reluctant' LL due to Negative Equity with serious Debt but also so that it is much easier for LL to evict tenants that don't pay rent, or tenants that behave anti-socially.
Instead of making social housing rents raise to 80% of market value rent - LOWER Private rents (gradually, year by year, over 5 years) until they match social housing rents. If the LL's get the property repossessed because the rent doesn't cover the mortgage - TOUGH! It's a HOME (a basic NEED and RIGHT) not a flashy car etc. You LL's already HAVE a HOME - the people renting DON'T. Your 'investment property' is their HOME.
Build more social housing. Of a size that makes sense - stop trying to build 3 bed houses that are the same size as two bed houses, splitting them into 3 beds and squeezing families with 4 dc into them. Or in a road near me - stop building 1-bed studio flats, splitting THEM into 2 bed flats, and housing families of 4 into the space that is meant to be occupied by ONE.
Just as a side note though - Lone Parents also get the single person discount, if all their dc are under 18yo, or still in FT education. So scrapping that would hurt Lone parents massively - a 25% increase in a bill could cripple someone like me.