Mia,
After trying to make contact with MKM and Rise, I was eventually told to direct queries to Express Newspapers as they had taken in back in-house. I did so, and wrote first to the general address, and after no reply, wrote to the proprietor, Richard Desomond, explaining the situation, and asking for a response within 10 days, otherwise I would take legal action. I didn't get a response, so initiated a claim in the small claims court, all done on line.
Express Newspapers are defending the claim, and so I have documented the whole saga, including items from BBC Watchdog, the Advertising Standards Authority, and quotes from this forum. I will keep you all posted as to how I get on.
All the best
Marcus