Henderson's Yorkshire relish

Never heard of it. Why not just email the company and ask if they have any stockist in your locality?

Hendersons produce a relish ,but not Yorkshire relish as the tradename "Yorkshire Relish " belongs solely to Goodalls ( now Robert Roberts). This was established in the first trademark infringment case in the 19th century. Hendersons can be bought by mail order from the Hendersons of Sheffield website http://www.hendersonsrelish.com/ ,but why bother when you can obtain the real thing and its Irish ( from 1933). One thing that I think is a great shame is that Goodalls abandoned the traditional bottle and design for a modern design that is common to a couple of their other sauces and is very bland and uninteresting and does not even relate to the packaging of YR sauce its thicker cousin.