YSK that first aid changed quite a bit in the last few years, so if haven't done training recently, you should!

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British Red Cross first aid resources

https://www.redcross.org.uk/first-aid

Learn first aid with education resources, advice and courses from the British Red Cross, including first aid at work.

British Red Cross first aid resources

Why YSK: there has been quite a development in the first aid medicine and some things we used to learn are now regarded as myths and should be avoided. Anyway it always good to, keep your first aid knowledge up to date.