Picked up one of these in the store in Macclesfield. Currently £3.62 on Amazon - http://www.amazon.co.uk/Interior-Dash-Shine-All-Kit/dp/B0070WZ3U8
Used it this evening and it really does do a fantastic job. Will be back to buy a few more.
In the pack you get a sponge and 200ml spray.
Gets a good review.