i believe the midnight (hennessey rd, near the bridge, before fire station) goes to Tai po (separate one to Sheung Shui), separate midnight red mini bus, I think around HK$28
normal time red minibus is a lockhart rd (street behind the midnight one ) is the same one goes to shueng shui and fanling via tai po, cost HK$23 to taipo HK$27 to sheung shui/fanling
Central to MK is another way then to tai po, should be opposite at sin tat, argyle st, adjacent to sai yeung rd south, also goes to other stops through out mk, should be more expensive as you go through two mini buses.