Neff and AO are offering cashback on selected ovens if you trade in an old one. Ao already have a very good price of £589 for Neff's larger (71l) Hide and Slide oven, but the trade in reduction of a further £100 makes this cheaper than many 'graded' sellers are offering the same model for.
Plenty of cheap/free integrated ovens on gumtree/ebay if you don't have a an existing oven to trade in.
Trade in is an oven for an oven only.
Be quick - trade in runs until the 11th July only.
Full details at: http://www.neff-home.com/uk/tradein140