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That looks like a Tektro R539, you could hunt about for spare parts or just buy this complete caliper on clearance at Ribble https://www.ribblecycles.co.uk/tektro-r539-long-drop-calliper-brake-front/
Would anyone know where I could get a replacement barrel adjuster screw for some Btwin rim brake calipers? It has snapped somehow so it's not easily possible to adjust the brakes.