It depends on your company, but the statutory minimums are awful.
You get a minimum of 2 week's extra pay if you have over 2 years service, and Job Seekers' Allowance is about 77 quid a week - so imagine living on less than $500 a month.
Healthcare access (via the NHS) is unaffected, you might be able to get free prescriptions too.
But in general it's terrible.
As always in Europe you either want to be an ultra-rich landowning aristocrat (little to no property tax, inheritance tax, etc.) or very poor/unemployed (e.g. a refugee) so you qualify for state housing, etc. - work does not pay. You pay high taxes and then don't qualify for assistance when it matters. The USA is better by far where you can just manage your own savings with your 3-4x higher salary, healthcare is still an issue though.