If i were you, I would hold on to property you own for as long as heavenly possible. This is because the security of standard tenancy is never great. You may find yourself having to move every 6 or 12 months (the standard tenancy periods) and there is no such thing as "putting your roots down" once you are a tenant. Please re-think your options carefully. Having to move, never knowing what in next 6 months, arguing over deposits, disrepairs etc not a future I would wish on anybody.
But if you have to move, and you apply for Housing Benefit, you will be assessed on your income and savings, which will be then compared to "local reference rent". LRR may be lower then your actual rent if your accommodation is more expensive then the average in your locality. The Rent Officers who seem to be oblivious to property market prices explosion decide what is appropriate local average rent. The outcome is that the assessment for benefit may not calculated on your real rent but on the LRR, leaving you to pick up the difference.
Often though the LRR equals the actual rent.
Please check this link for more info:
DWP - Advisers - Technical guidance - RR2 - What you can claim for
and promise me you think verrrry carefully before you sell your home.