The domain richardandjudybookclub.co.uk is registered to Cactus TV, the company that produces the programme.

A check of the contact page on the R&J Book Club site reveals a customer services number in addition to the 0870 orderline (quoted in the OP) and address (also quoted in the OP). It is 01234 567891 and it is not recognised.

I wonder where the ADMAIL address goes. I think that it's likely that this is operated by an outside company, but I can't find any more clues as to what this company is.

Perhaps the company operates other book clubs and uses similar 0870 numbers. A Google is in order...

...Red House Books uses the number 0870 191 9980 its website has similarities to the R&JBC one.

They also lead to very similar IP addresses:
www.redhouse.co.uk = [ 213.146.154.203 ]
www.richardandjudybookclub.co.uk = [ 213.146.154.122 ]

The Book People, which even mentions R&JBC. Some geographical numbers are given:
Quote:


01248 679393 to 399 answer as "The Book People"
392 "The Month"
391 "Times Direct" (The Times newspaper)
388 "Red House"
381 No answer
380 "Red House"
377 No answer
370 "Campbell Books Direct"
368 No answer
366 "The Reading Group"
362 "Sunday Times Direct"
361 Says it's no longer in service and gives 0870 (for Sunday Times)
360 "Ireland on Sunday Bookshop"
349 No answer
345 No answer
344 "Richard and Judy Book Club"

I tried 01248 679399 down to 01248 679340. Those that aren't listed are out of service, and the Richard & Judy Book Club is 01248 679344.