SPF 15 is OK, although I would prefer a 20. I live in a very sunny place and especially my arms burn to a crisp when going about my daily life. I also run 5 km x 3 times a week and would like to protect not only my face but also my legs and arms during these.
I don't live in the UK and delivery of online orders from the UK would be quite expensive, I fear.
it's worth checking how much GP would charge to ship to France though? alternatively, this french site is pretty good: http://www.sens-nature.com/index.php?cPath=212_216_226 they stock Lavera, Weleda and Dr Hauschka