CJT-80 wrote on Mar 9^th, 2011 at 9:53pm:

The address in the link provided, a PO Box, nonetheless:

bonprix
PO Box 3856
Sheffield
S96 5WD

Now Google for pages which mention that PO Box: "po box 3856" s96

The results point to it belonging to Grattan. Search for this company in the database and the first entry that pops up is a Sheffield one: 0114 263 7077 There are even some freephone numbers.

Let us know how you get on, what you try, what works and what doesn't.