Why don't some people offer their seat anymore?

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"I can count on one hand the number of times I have been offered a seat on the Tube," says Hannah Emberton, who is six months pregnant. The 28-year-old from Camden said she chose to wear a Baby on Board badge issued by Transport for London in the hope of being offered a seat on her commute, but people rarely pay it much attention. As the 'Baby on Board' badge scheme turns 20, we've been speaking to Londoners with similar experiences, and asking: Why don't some people offer their seat anymore? (Image credit: Getty Image)