@Sarah94 It is considerable more complicated than that - sorry.
I'm on ESA, there is a newer benefits system which
@lunarainbows is describing above, as mentioned below the main decider as to which people get put on it both geographical and temporal, with some people, in some area's, in some situations, being put on UC, and other people, in other areas, or more 'complex' cases, being on ESA.
The rules for both ESA and UC vary, as do the amounts paid.
For ESA - If they accept that you are disabled, and are unable to look for work (not the same thing) then you get one rate - around £73 per week, as living expenses, to cover everything other than rent and maybe whatever they call rates these days.
Unless you have claimed continuously for more than about the last 5 years, in which case you get a bit more (about an extra £25, without checking the current figures)
Then, if you are considered not just not able to look for work, but also not able to do anything which could move you in that direction, as it would be dangerous to your health to do so - they give you about an extra £15 a week on top - but only if you have had a continued claim for about the last 15 years.
I have been in the support group for at least 8 years, probably longer, and prior to that I was on incapacity benefit for about 20 years - so I get £128.45 per week - living expenses.
My rent is also paid, £84 a week for a one bed flat and I don't pay rates - in most areas I would have to pay at least part of them.
So for someone who is so like me that they are me the amount I may receive is anywhere between £158 and £224 per week, for everything, with the only variable being when my claim was started.
That's just the start of the system, there are many other benefits, some of which a passported (you can only get them if you get something else)
It is not as simple as £x per week.