I have managed to find the thread and I was right about the price but it's 1 metre x 8 metres, still got plenty left somewhere in the shed. It is in fact Lumisol and this is where I got it 3 years ago
http://www.lbsgardenwarehouse.co.uk/...sfile=1&jump=8
Here is the original thread, start at the last page (9) and read back from there
http://www.shelledwarriors.co.uk/for...Lumisol&page=9