speak with a professional like a career consultant, but here are what i have so far.
i would write modules that had some business, econ and social history on your cv and explain what you have learned. you can write the title of the dissertation on your cv. when writing a cv, think long and hard about what you have done in the last 3 years. there must be something you can write on your cv.
you could get involved in local charities. dont do cooking for homeless, raising money for cancer or shop-assisting at oxfam. never do shop-assiting as others suggest here, they dont take you anywhere. they dont get you the right connections or the long term career prospect. these are deadend roles for retired people. try to get a voluntary role in a charity office, hopefully in big charities like shelter, this often leads to a permanent post. you will be surprised to learn that senior members in the third sector earn a lot more than accountants at pwc. if you do really well in the third sector, you might be joining some big-name international ngo or politics later. (my bad, i used ngo wrongly.)
another promising lead is to look for a job in your alma mater. why not try your department, library or the central administration? they dont need any experience (assuming you can do word and basic excel) and the starting salary will be around 18 - 22k. you might be surprised when you realize that a senior librarian at a uk university makes about 55k and they do quite a lot of database management.
the public sector is another area you might want to look into. your local council and library. you could potentially do art projects with local schools or local communities that way?
conclusion is think long term. dont do shop-assisting because those roles are temporary. dont work as a care-taker at old peoples home because it wont get you anywhere. if you join a library you have a career, if you join your university as an admin, you have a career, if you join a local council, you have a career.