Growing outside in the southeast of England

Hi, I got a couple of plants outside that have just started to show some hairs. I don't know what strain they are but I am a bit worrid about how long the flowering process will take as a friend said they won't b ready till november. Is this true. Also I have some silver haze cuttings out there. Thing is my other half won't let me use lights coz she is scared. What do you think the chances of getting busted. All I want is 1 plant under a 400 watt hps bulb. Anything you can say to help me put her mind at rest would b great !!!