Ok Just been into my local morrisons and Have notice they have FINISH QUANTU MATIC on offer from £10.00 To £5.00 Not 100% sure if nationwide but I should imagine it is, Then It clicked That at the moment finish have an offer for £5.00 of FINISH QUANTU MATIC so making it free!!!
you have to buy the product then send the receipt of to finish to reclaim your £5, With the form they send you via email,
Not tryed this but in theory it should work!! (due to not having a dishwasher lol)
Link to Finish voucher: http://www.finish.co.uk/?gclid=CL-WqJz5zKMCFYKY2AodZG3wtw