Just thought I'd highlight this for anyone who went for this deal - http://www.hotukdeals.com/item/232230/vodafone-sim-only-10-per-month-90-q/.
There is a notice on Quidco saying the following -
"Please note that we have been advised by Vodafone that for the time being cashback will not be paid on the £10 monthly SIM only deal however any purchase made before 12pm on 26th August will still be honoured. The 4 month validation still applies."
Oh well, you win some, you lose some. Just make sure that you've cancelled your contract!!