Natural Sun Protection

This really is just an appeal for help and advice into bloggy-land.  Now we don't go out sun-bathing or anything like this, but working in the garden and walking outside, we naturally get exposed to the sun a lot.  The Italians like to roast out in the sun on the beach... in summer.  Then they will put on conventional suntan lotion.  However, this early in the season it is impossible to find in the shops.  I don't have too sensitive a skin and colour easily, building up my own protection.  Of course I am also sensible and don't over expose myself.  However, Susan is an Irish Rose with fair skin, and she wears sun protection all year around.  She has now finished her last tube and cannot find any in any of the shops anywhere, which is just ridiculous!

So, the question is, is there a natural alternative, preferable something based on olive oil and wild herbs, which we have plenty of.  I have found some recipes on the internet with various exotic oils, which are difficult for me to obtain and are very expensive, including mixtures containing almond oil and jojoba oil.  What are the active ingredients in sun protection creams and where can I find them in nature?

Any advice much appreciated.

Additional note 2 July 2014:  Just come across this recipe, which seems worth a try:  http://higherperspective.com/2014/07/make-non-toxic-coconut-oil-sunscreen-guide.html?utm_source=MAM