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steel rims
If you ever want to stop in the wet you will want new alloy rims, but among the least worst options for steel are Kool-Stop salmon compound pads; the Kool-Stop Continentals should fit the Weinmanns. For lever hoods Cane Creek make compatible ones: https://www.sjscycles.co.uk/brake-levers/weinmann-mafac-style-cane-creek-road-brake-lever-hoods-tan/
Not sure where in London's famous London might have them in stock though.
What's the name of the break pads I need for steel rims and wiemann type 730 calipers? Anywhere in London stock them and also where can I get rubber hoods for said breaks where the wire comes out the top of the lever?