VAX 2 X Ultra Plus Limited Edition Orange Scented Carpet & Upholstery Cleaning Solution £16.99 @ Pricelover
Seems a good deal for 2 bottles that sell for on average £16 a bottle. There is a del charge of £5.99 but the only way I can see of getting it cheaper is by purchasing 4 or 6 bottles from the same place. The online reviews reckon this is the best Vax solution. I know there are cheaper brands out there but you get what you pay for.