The upper brand: Alexa Chung at M&S takes on Kenzo for H&M

Both fashion collaborations have been hyped to fever pitch as they go head to head in final sales push before Christmas

Hans-Ulrich Obrist tops list of art world’s most powerful

Artistic director of London’s Serpentine Galleries, dubbed ‘curator who never sleeps’, wins ArtReview’s accolade for second time

Burberry’s seasonless clothes usher in fashion’s stream-of-consciousness era

September show breaks with arcane structures of fashion week, putting clothes online and on the catwalk simultaneously

Microplastics should be banned in cosmetics to save oceans, MPs say

Environmental audit committee calls for ban after hearing that microbeads harm marine life and enter the food chain