Sadiq Khan has continued his attacks on Conservative rival Zac Goldsmith over housing by launching an advert saying only Khan can provide affordable homes.

The advert, emblazoned with the works “Homes you can afford”, will be up around London until the election on May 5.

The Labour mayoral candidate has released data showing 98 per cent of the capital could not afford a “starter home” under Goldsmith’s plans. In the 629 wards in London, someone on the average income could only afford a starter home in 12 of them.

Housing Charity Shelter has shown that households must earn £77,000 in order to afford a Conservative “starter home”, which can cost up to £450,000.

In his manifesto Khan promised 50 per cent of housing would be genuinely affordable, with a mix of social rent, living rent and ‘part-buy part-rent’ housing.

The MP for Tooting has spoken out about overseas investors purchasing property in London – raising prices at the expense of local people being able to own a home.

“Londoners face a clear choice: homes you can afford under me or homes you can’t afford under Zac Goldsmith”, Khan said.

“The housing crisis has gone from bad to worse under the Tories and Zac Goldsmith’s ‘starter homes’ simply won’t be affordable to Londoners on average incomes.”

Housing is the most important issue facing Londoners, with 56 per cent saying it was one of the biggest challenges facing the capital, according to a ComRes poll for the BBC released last week.

London is currently in the “short campaign” before the mayoral election – the month immediately preceding the vote.