The British Science Fiction Association have issued an apology to Doctor Who show runner,for an offensive tweet made by one of its committee members last Friday and sent to the writer.At the time Moffat retweeted the comment askingAlthough the tweet came from a personal account, the BSFA committee felt the individual concerned was seen as closely linked to the organisation. They wanted to make clear they did not endorse either the choice of wording or the sentiments expressed in the offending tweet.A letter of apology has been sent to Moffat, who told the Association that he understood the circumstances and has taken no offence from the BSFA.Steven Moffat joined twitter last year as part of the promotion for. He now has over 150,000 followers.