It wasnt done great at the beginning when the drive was laid but it was made a lot worse by the water company that whacked it down any which way not even using the correct colour blocks.
Thanks to this website and forum for helping a noob like me do a half decent job.
http://thumbsnap.com/i/QyTb2bDm.png
Needs a another jet washing and clearing of what looks to be black spot staining and it will look even better.