when you leave the tube ,the first street on the left ,where there is stalls selling fruits and vegetables ,you have 3 shops.
After that on the main street on the left you have 2 more.
On the right you have many in basements,but not that much stuff.
If you are there a week-end on the square where they sell clothes there is few. But not worth the mess.
Along the canal you have few ,many with live boot.
In the market itself you may find really good stuff.
In the main street there is a place 'Electric something ' where every second saturday there is a records fair.
On Week-End it is REALLY a pain in the ... to be there.
The shops in the street are open all the week ,and it is there than you may find the more if you have a want list .
cds and lps .
Before going home dirty and exausted ,you may have a look to Virgin and Tower ,many times ,they have real bargains.
My 'tourist tour of London ' is about 56 shops.....Some outside London ,like the marveillous Benos and the ones north east of London.
Keep in mind that most of the people working in this shops are just f.. bastards ,if they are really impolite with you ,just insult them.