Just want to point out that there are special spray's available that are not designed to incapacitate someone and those are the colour-marking sprays. Therefore they are completely legal (check first).
They are applied the same way as pepperspray but they foam up on contact with the skin, stopping an attack because the culprit can't see and is surprised by the spray.
Furthermore, they contain a dye, which is visible on the face for about 3 days and helps to identify the bad guy by the police.
I know it isn't much, but it might be enough to distract some one long enough for you to get out of the way.
http://www.shadowatch.co.uk/tiw-spray.htmlhttp://cgi.ebay.com/SELF-DEFENCE-IDENTIF...idZp1638Q2em122