What about Housing Benefit?
For most people on benefits, Job Seeker's Allowance or Tax Credits are not a large part of what they receive from the government. By far the largest proportion of their benefits is Housing Benefit. In my area, the Local Housing Allowance rate for a single person is £150 per week, it is more if you have children. Job Seeker's Allowance is £73.10 per week. Tax credits if you are in work will be less than that, depending on how much you earn. Add to that Council Tax support and healthcare benefits.