Well, they are from the UK (From everywhere, Ireland, England.) which are all a pale bunch. They all ended up in Australia, and the heat there is immense. It was originally inhabited by Black people (which skin could easily withstand the aforementioned heat). But the pale, thin skin of the British wasn't "designed" for the incredible heat, and allotl got skin cancer/sunburn etc. Of course, the British genes hasn't changed or adapted (humans don't do that, well, except for the accent atleast) so Australia still has the most people with skin cancer/severe sunburn
The grammar and structure of this post is incredibly faulty, but it's late and i can't focus.
I hope you got everything