Sexually explicit letters and “lonely housewife” posters about high-profile pro-democracy Hong Kong exiles have been sent to people in the UK and Australia, marking a ratcheting up in the transnational harassment faced by critics of the Chinese Communist party’s rule in the former British colony. Letters purporting to be from Carmen Lau, an exiled pro-democracy activist and former district councillor, showing digitally faked images of her as a sex worker were sent to her former neighbours in Maidenhead in the UK in recent weeks. It is the first time that…