Is it worth buying expensive sun cream?

My partner insists on buying products that cost more than £4o, while I prefer own brandEvery week a Guardian Money reader submits a question, and it’s up to you to help him or her out – a selection of the best answers will appear in next Saturday’s paper.Help end a family dispute. My partner insists on spending a fortune on expensive Ultrasun suncream. I’m quite content with Lidl own brand, which I think does just as good a job, for me and the kids – if I can