Try the Russell Hobbs website. They have a downloadable instruction booklet in pdf format.
E.g. for model 13824:
http://www.russellhobbs.co.uk/product_details.html?products_id=139
For model 10951
http://www.russellhobbs.co.uk/Dual_Pot_Slow_Cooker_qp_143.html
Edward Morgan, April 2009