I would suggest that poverty is subjective. I like this definition:

Subjective poverty is an individual's perception on his or her financial/material situation.

The poorest person in Cardiff is very wealthy in comparison to a person living in Uganda (where the average wage is about $80 per month). An employed person in say Kampala (capital city of Uganda) would be relatively wealthy compared to a person living in a rural village in Uganda (I don't have any actual data but I would say that is a reasonable assumption) but still relatively poor compared to the poorest person in Cardiff.

I use Uganda as an example because I have been there several times. Having been there, I can say that no-one in the UK lives in such poverty believe me.