Are different sexuality people under-represented on the BBC?

The BBC has come under criticism this month for failing to represent enough people on their channels who are from lesbian, gay and bisexual backgrounds.  The research body's argument is that as a public service broadcaster, the channel has an obligation to educate people about different sexualities.  What lesbian / gay / bisexual characters or presenters are you aware of on tv?  Are they shown in a particularly negative way?

http://www.dailymail.co.uk/sciencetech/article-2205033/Twitter-largest-overhaul-launch-brings-cover-photos-page-builds-mobile-apps-ground-up.html