The question "ii. The current flowing through the 8 resistor" is incomplete as it refers to an 8-ohm resistor without a circuit diagram or further context. Please provide the full question or diagram

Power from bulbs: $P_{\text{bulbs}} = 20 \times 60\text{ W} = 1200\text{ W}$
Power from heaters: $P_{\text{heaters}} = 2 \times 1000\text{ W} = 2000\text{ W}$
Power from security lights: $P_{\text{lights}} = 2 \times 500\text{ W} = 1000\text{ W}$

The total power used is $\boxed{\text{4.2 KW}}$.

Where $P$ is total power, $V$ is voltage, and $I$ is current.

The total current drawn from the mains supply is $\boxed{\text{17.5 A}}$.