I don't know what a "life-changing prize" might be, but the following notice on the Channel4.com web site certainly looks interesting:
Channel 4 is looking for families to take part in a brand new series in which people could win a life-changing prize in time for Christmas.
If you would like the chance to be part of this exciting new series we want to hear from you now!
To apply or to find out more please get in touch leaving your name and a contact number.
Email email@example.com or text/call 07768 537 851 / 020 77493174.
We are looking for families from across the country of all ages, races, religions and creeds.
You can see the announcement at http://www.channel4.com/programmes/take-part/articles/home-for-the-holidays
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