A staggering HK$20 billion allocated to a government plan to buy private properties for welfare facilities will not be enough to fund all the premises earmarked and critics say the proposal will fail to help the districts most in need of such services, it has been revealed.Instead of the 130 facilities announced in February’s budget, the welfare department released a list of about 160 in the city’s 18 districts on Monday, including 55 elderly activity centres and 28 childcare centres.The plan,…