where can i find the things needed for screen printing t shirts in London?

i need a shop that can provide me the diazo photo emulsions, the inks and whatever is needed..
such as speedball product

http://www.londongraphics.co.uk/acatalog/Screen_Printing.html

http://www.londongraphics.co.uk/acatalog/Daler-Rowney_System_3_Screen_Printing_Mediums.html

Wear What You Make: Screen Printing 101

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