Antiques Roadshow expert John Foster didn’t mince his words when he heard how one guest had treated a piece of historic Olympics memorabilia when the BBC show headed to Lytham Hall. Foster, Fiona Bruce and the rest of the team first travelled to the Lancashire landmark back in 2019 but on Sunday evening, BBC viewers will get another chance to see exactly why the antiques expert was left rather surprised. During the instalment, Foster met one guest who revealed her familial ties to England’s first medal-winning Black Olympian. As he perused over an array of medals and photos on the table, Foste…