As dermatologists, we understand the confusion around SPF in the UK. The sunscreen market has exploded, and misinformation spreads faster than you can reapply SPF (which, by the way, should be every two hours).
But if there’s one thing that’s true, it’s this: sunscreen is the single most effective way to look after the skin on your face.
However, if you walk into any Boots in West London, there are hundreds of options. SPF30 or 50? Chemical or mineral? Cream, gel, or spray? Water-resistant or not?
Our guide cuts through the noise. We’ll explain what actually matters when choosing sunscreen, and give you practical advice for protecting your skin in London’s unpredictable weather, even when it’s cloudy.
Before we dive into products, let’s unpack why sunscreen deserves its place in your daily routine.
Too much exposure to the sun’s UV rays is one of the biggest causes of skin ageing. While there’s absolutely nothing wrong with going on holiday, enjoying the outdoors and soaking up the sunshine (whenever we can get it in London), it’s important to do it in moderation.
There’s 2 types of UV rays you need to know about:
Even on grey days in London, UV radiation is present. The UV index in London reaches moderate to high levels from April through September, and you can still get sunburnt between October and March on bright days, especially if there’s snow, which reflects UV rays.
This is why we recommend year-round sun protection in the UK, not just during summer holidays. Your future skin will thank you for it.
SPF stands for Sun Protection Factor, and it’s a measure of how much longer you can stay in the sun before burning compared to wearing no sunscreen. For example, SPF15 allows you to stay in the sun 15 times longer without burning, SPF 30 allows 30 times longer, and SPF 50 allows 50 times longer.
Our dermatologists would advise wearing SPF30 as your daily minimum, SPF 50 for extended outdoor exposure or if you have very fair skin or a history of skin cancer. Make sure to look for a “Broad Spectrum” label on any sunscreen product, as it means the sunscreen protects against both UVA and UVB rays.
Having the right sunscreen is pointless if you don’t apply enough of it. For your face and neck, you need 2 finger-lengths of product (about 1/4 teaspoon or 1.25ml), and for your full body, you should be using a shot glass worth (about 30ml).
Apply to clean, dry skin as the final step in your skincare (and before make up) and don’t forget commonly missed areas like your ears, neck, hairline, scalp parting, eyelids, lips and the tops of feet. A note on make up – some make up has SPF but it may not be strong enough and also no broad spectrum, so whilst this may be ok in the middle of winter, chances are you need more of it and better quality for the summer months for proper protection.
We’re often asked which specific sunscreens we recommend. Here are formulas we see working well for our West London patients:
Sunscreen is crucial, but it’s not the only line of defence against UV damage. When the UV index is highest, we recommend wearing protective clothing, e.g. long sleeves, wide-brimmed hats and sunglasses with UV protection. We are human and know that being outside and in the sun feels good – we get it, just apply/be sensible about how long you are out for – not only to protect against skin cancer, but also photoageing (if wrinkles aren’t your thing).
Check the UV index – this is available on weather apps and skin patches, and plan your outdoor activities accordingly. Most importantly, avoid sunbeds (!). They emit concentrated UVA radiation and significantly increase your risk of skin cancer.
The single biggest mistake people make isn’t choosing the “wrong” sunscreen—it’s not using sunscreen at all because they’re overwhelmed by choices or misinformation. Pick any broad-spectrum SPF30+ that feels good on your skin and fits your budget. Simply apply it every morning, and reapply when you’re outdoors for extended periods.
If you’re concerned about existing sun damage, moles, or skin changes, book a dermatology consultation with us or a mole check.
We can assess your skin, recommend appropriate monitoring, and discuss treatments for sun damage such as pigmentation or fine lines, in a safe, private and comfortable environment. We’re here every step of the way to give you peace of mind.
At No. 23 Skin, we’re here to help you navigate skincare that actually works, and that includes getting your sun protection right. Located in West London, just off High Street Kensington, call us for a chat on 0203 9411815 or book an appointment online.
We’re passionate about evidence-based skincare, and there’s no stronger evidence than the decades of research showing that daily sunscreen prevents skin cancer and premature ageing.
Start today, and your skin will thank you.
Helen & Dr Cherry
CoFounders
No.23 Skin
02039411815
NB: this page is for information only, if you have any concerns about your skin – particularly if you have a mole that is new or changing, then it is important to get it checked in person by a medical professional; a dermatologist or your GP.
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