You can try 協康會 的青蔥計劃, My son is having training in their centre every week, it costs HK$500 one session for 50 minutes. Their phone no. is 2393 7555, website: www.heephong.org.
No need worried too much, 1.5 yr is very easy to catch up. My son can catch up within half year. Dont wait for the govt, they won't give you crouse at this case. They only will teach you how to assist yr kid, and told you the method. But most of the methods are already know, waste yr time.