Businesswoman Arabella Arkwright resigns after promoting anti-Muslim material on social media.

A Vote Leave board member has resigned after it emerged that she promoted anti-Muslim material on social media, including an image of a white girl in the middle of a group of people wearing burqas saying: “Britain 2050: why didn’t you stop them Grandad?”

Arabella Arkwright, a businesswoman who sat on the board and finance committee of Vote Leave, stepped down after the Guardian asked her about a series of tweets and retweets from her account.

Other retweets included a link from Tommy Robinson, the founder of the English Defence League, suggesting UK Muslims were trying to build an Islamic state in Britain.

Another retweet came in response to a Twitter user saying they would never eat tikka masala again if it “got seventh-century barbaric savagery” out of Britain. A reply from Arkwright’s account said: “No to sharia law. By by [sic] tikka masala .”

A further retweeted picture has a “Stop Islam” badge in the corner and asks people to compare photographs of Yazidi women and Syrian men fleeing Isis.