There's a spot in Highbury, just where Blackstock Road becomes Highbury Park, where charity bookshops face each other on opposite sides of the highway. I popped into them both this afternoon.
This is the more remarkable, more ramshackle, but alas less rewarding to the browser, of the two.
I don't know whether 'A. Wilsher & Son' was always a second-hand bookshop, I rather doubt it, but I haven't been able to find out more.
Across the road is an Animal Aid (or something similar) bookshop, which is well stocked and run. It even has a 'Red Politics' section - though it's not anything like as enticing as the billing might suggest.
That goes broadly for both bookshops and their stock. I suspect the interesting stuff gets siphoned off, as so often happens with charity shops. Most never quiet realise their browsing potential.
Andrew Whitehead's blog
Welcome - read - comment - throw stones - pick up threads - and tell me how to do this better!