where to get 'small' belfast sinks

By 'small' I mean 18" x 15" x 8" rather than the usual 24" x ? x?. Have found just a handful of websites that stock these and they're either too far away to collect from or can't get stock for several weeks. I can't believe how hard the small ones are to acquire. I'm in Surrey/Sussex/Kent area, Anyone know any stores stocking these ?
Thanks
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I was looking at one of these recently. Grahams (Part of Jewsons) do them in a range of sizes. http://www.graham-group.co.uk/graham-webapp/index.jsp
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