Former British health minister Wes Streeting, a potential candidate for the leadership of the Labour Party, said he backed the introduction of tax changes which would equalise capital gains tax with income tax to make the system “fairer”.Streeting said on Saturday that he wanted to challenge embattled Prime Minister Keir Starmer if there is a contest, days after he stepped down and urged Starmer to set a timetable for his departure.The former health minister, who has already said he...