Do you guys not have pawn shops, smoke shops, and check cashing shops over there?
We do have Vapeshops (before that 'Legal High' shops) but apart from those Charity Shops you get a lot of 'Gambling' (aka 'High Street Bookies') chains in those areas where the footfall has gone away to the out of town supermarkets or where the landlords are sitting on what they hope will get turned into flats so they can make a profit.
What I would say regarding Oxfam, at least in the area I live is that the book selection is suprisingly good, both in Oxford and Chipping Norton's where the second hand book selection has given me some great reads and I have seen them refuse the 'Celeb/Sports star' biogs and bundles of Harry Potter cast offs from people while waiting to be served.
Also, how do you cash a cheque without validating signature (from whichever bank)?
Here in India atleast, cheques are cashed only at banks, and often are a/c payee only (no cash disbursed, only account transfer). They get truncated at the bank (basically scanned), and cleared overnight as a part of the CTS (a NPCI product).
However DDs (Demand Drafts) are your equivalent of cashiers cheques, and can be redeemed at par instantly, anywhere (or paid into an account).
In the US, a lot of poor people (and illegal immigrants) are unbanked. But also check cashing places also tend to do title loans (turn over your car title for a temporary loan) and other sorts of "fast cash" loans with usurious rates. They and pawn shops are they type of businesses that show up in areas of town where the cost of retail spaces drop.
A surprising amount of the UK tech industry has history connected to the gambling sector one way or another, be it sports tv, online related, making parts for pub slot machines etc.