hunter wellingtons size 6, need a size 7

Hi all I just purchased Hunter wellies in black, size 6 womens. They are just a tad too small. Does anyone have a size 7 and need a size 6 (ideal, but I know too hopeful and unrealistic!). Or does anyone want to purchase a size 6 so I can get a size 7? I’ve worn them twice now, so they’re in almost new condition. Take care, Kate