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Update - Sara, wish I was as active, it is only in my mind and I employ the local lads, if I can find them. They are always looking for ways to make a bit of pocket money and the poor little sods have no chance of getting permanent work.
Rowan, don't worry, I decided against Jeyes fluid, the smell was too strong.
Builder and Heathfield, I finally found some stuff to paint tarmac, had to order it as it is not in general use and the lad up the road painted it on. It looks really good, although I expect it will soon mark with people walking on it etc. Thanks everyone, for your help.