Working should always give you a better quality of life than not working. There has to be an incentive for giving up your free time to work, even at minimum wage rates.
The only exception being genuine disabilities where there should be higher benefits to cover the extra costs you incur because of the disability (if any), and a level of "compensation" for what you could have been earning were you not disabled - maybe more akin with average/median earnings, but average/median earnings level has to be the maximum of any and all benefits, including rent allowances, free prescriptions, council tax discounts, regardless of numbers of dependants etc. No one living on benefits should receive more benefits (in total) than the average full time worker (i.e. median/average wages).
If people (who aren't genuinely disabled) don't want to work, then they should have nothing more than a very basic subsistence level standard of living.
Of course, to get there, we need to radically rethink the tax and benefits systems so that working ALWAYS pays, whether moving from unemployment to employment or moving from part time work to full time work, or taking an extra shift, taking a promotion etc. We need to get rid of the tax trips, cliff edges, etc., where you can actually be worse off by working or working a bit more, due to the combined loss of benefits and increase in tax/NIC/student loan repayments, etc.
I'd argue strongly for a maximum "loss" of 50% deductions at ALL income levels, so that doing an extra shift, taking a promotion, working an extra day, moving from unemployment to employment means you're GUARANTEED to keep 50% of your earnings, i.e. a combination of tax/NIC/student loan repayments and loss of benefits NEVER means you're worse off by any more than 50% of your extra earnings. That way there's a massive incentive for people to work, or work more/longer/harder as they're guaranteed to see at least half their extra wages in their pockets!
We need to grow the economy to get out of the financial mess we're in and the only way to do that is to get people working, not paying them to sit on their arses, and that is true at all stages, i.e. school leavers, middle aged, early retirees etc - incentivise them all to work, whether benefit claimants or not, by guaranteeing they keep at least 50% of their wages, and we'll see productivity, service standards, etc increase which will grow the economy!