I have used Sodium Chlorate for many years. However, it seems to have been banned, I think it is something to do with EU rules. Is there an alternative to clear weeds from my driveway, between garden flags etc, without having to buy expensive ready sprays. Some websites e.g. Wilkinsons, advertise it, but when you go to their store website, it says no longer for sale. It seems that you cannot buy it from stores, garden centres etc. It is still availabe on Ebay, but when you have paid the p&p, it is very expensive.
I use Roundup on my garden & allotment. It is much more environmentally friendly than other weedkillers, as it neutralizes as soon as it touches your soil.