Mcafee have increased their Quidco cashback to 35% in addition to the 50% off RRP when you buy through the Quidco link.
If you use the Quidco link to McAfee the price comes down to £24.99.
If you then use the following code (courtesy of RJ007): -
The price drops to £9.99.
With 35% Quidco cashback (£3.49) the price comes to £6.50.
(This does of course assume that it tracks and is paid but mine tracked ok.)