Thanks for the info. So it's pretty essential for a few weeks a year, and then you can stick it in the cupboard for next time.
I've never owned anything over factor 30, but try not to spend more than an hour in the sun in the summer - in Spain that is, UK is no cream bar face :)
It depends on what you do and what you wear. I think it was last summer or the one before that when I was doing gardening in the back yard one sunny day in June for a couple of hours. The day was quite warm although not hot but because I was shoveling dirt and carrying heavy bags, it felt hot and I took off my shirt. That was a mistake. The first night was very uncomfortable. My wife had to apply some lotion onto my back to ease the pain. It got easier but my skin was peeling for a over a week after that.
When I was a kid I remember getting a bad sunburn a once or twice.
I can manage without sunscreen at home from mid May to late August but only if I keep my shirt on.