Tomario 44mm Sink Bath Plug with Chain, 450mm Stainless Steel Ball Chain Hook for Kitchen Bath Sink Drain Stopper Plug (1 3/4 Inch, Drain Plug Size Between 45.5 to 42 mm) :
Bath Plug & Extra Strong Chain - Hart Plumbing Spares
Chrome Sink Plug with Chain for Kitchen or Bath - 45mm (1.3/4 Inch) with Ball Type and S Hook Shaped Chain Made of Stainless Steel 450mm (18 Inch) : Amazon.co.uk: Home & Kitchen
Bathroom Basin Sink Replacement Plug, Chain & Stay Bolt Chrome 11" Long Chain | eBay
Union Basin Waste, Plug & Chain
Smith's® (44.5mm-45mm) Black Plug & Chain - Bathtub, Bathroom, & Kitchen Sink Plug | 48cm Strong Stainless Steel Ball Chain With S-Hooks | Comes Pre-Assembled : Amazon.co.uk: Home & Kitchen