There are 3 main types of skin cancer--squamous cell carcinoma, basal cell carcinoma and melanoma. The first two are slow growing and, while they can be disfiguring, are almost never deadly. Melanoma is deadly.
The medical press conflates all 3 types, which is journalistic malpractice. The first two can be prevented by suncream. Deadly melanoma, however, is NOT directly caused by the sun. It is a failure of the immune system, the risk of which is greatly reduced by keeping optimum levels of vitamin d. My doctor checks my vit d levels every year to make sure I stay in range and tells me how much to take, which is 5000 IU per day for me.
In the UK you don't have enough sun to keep optimum levels without supplementation. I live in Florida, am outside every day and still have to supplement vitamin d to maintain optimal levels, and I am a Caucasian of northern European ancestry (i.e., very pale.)
I only use suncream when I will be near the water for an extended period of time. I also use a retinol product on exposed areas every evening, which prevents squamous and basal cell carcinoma from forming. My dermatologist, who checks my skin for incipient cancer every year, approves of this.
Vitamin d is essential to reduce the risk, if not prevent, many types of cancer. If you insist on using suncream please supplement with vitamin d and get tested regularly by your GP.