Sadiq Khan warned Londoners on Friday that his share of council tax bills could rise by an average of almost £30 a year.This will mean a typical household will be paying almost £425 a year to the mayor from April, in addition to about £1,500 or more to their borough council.Mr Khan published a first draft of the Greater London Authority’s budget for 2023/24, with a “working assumption” that benchmark Band D bills will increase by £27.89 – a rise of seven per cent.The exact rise will be published next month after the Government confirms how much support it will offer to City Hall and the 33 boroughs.The increase includes an additional £20 for Transport for London, as revealed by the Standard earlier this week. It is likely the Met police will get about an extra £5.50, and London fire brigade about £2.30.