I came across them when looking for a 4 inch triangle template - they're the only place I could find one. They don't seem to have a massive stock, but I (thought I) liked the ethos, and the site says 'All orders are dispatched within 2 working days. Our standard service is Royal Mail First Class.'
I've also just realised that they're called Hot Pink Haberdashery, not just Pink Haberdashery!