I've just ordered some Ultrasun SPF30 from QVC:
http://www.qvcuk.com/ukqic/qvcapp.aspx/app.detail/walk.yah.UKHB~UKB1~UKMC
I tried it from a tester pot in John Lewis first and it's really nice & light. You only have to apply it once per day too.
I also got a Shiseido compact foundation which has SPF30. Dunno why but I've suddenly got paranoid about protecting my face!