Hi I'm going to PRC for three months

and I am wondering if anyone knows if it's possible to get a three month tourist L type in Hong Kong? If not, whats the difficulty involved in applying for a renewal in country for a 30 day L type? I have both the UK and Australian passports and will be applying in HK as Singapore Cvasc won't let me apply for a three month visa here. I can only wait a maximum of 10 days there before I want to enter PRC. Thanks!