SATURDAY The Wall Versus Celebrities (BBC1, 6.40pm) Former England and Liverpool winger John Barnes teams up with Sky Sports pundit Chris Kamara as they attempt to defeat the formidable Wall and win a decent amount of cash for charity – but one mistake could see them losing everything. SUNDAY Million Pound Mega Motorhomes (Channel 5, 8pm) If you have ever fantasised about owning a mega motorhome, now's your chance to dream even bigger – they are becoming more luxurious and creative than ever. This programme takes a journey into the country's most impressive motorhomes, uncovering the secrets of the companies who manufacture these elite machines, visiting a trade event where must-have gadgets tantalise owners, and meeting the motorhome makers who can create bespoke holiday homes for a million-pound price tag.