This is an interesting one.
Dave noticed in
this thread they had similar things in common with other book clubs like
www.richardandjudybookclub.co.uk and the
The Book People Ltd.
I noticed the Book People had same postcode (near enough) as Red House Books.
A website trace shows it is registered as:
Suite 17
St James Court
Wilderspool Causeway
Warrington
Cheshire
WA4 6PS
Although this could be wrong.
I suspect they are part of some big group and share the same contact centre, etc as the book companies mentioned above.
Dave mentioned in his post (in the link above) some numbers that could be tried but I'm at work at the moment so can't try any.
Sorry AVNM - you beat me to it.