HID kits are ILLEGAL without projectors and headlight washers!!

Although i do have a set of 6000k HID's in my Sierra, they are immense at lighting up the road, road signs miles away and especially Police cars

They would fail an mot as they won't have a beam pattern, so just buy a HID set off ebay for £35 ish but get the 4500k bulbs (no higher as they will be more blue and more noticable to police) 4500k is perfect as they are white so look legal and still bright as hell.
Don't forget to change the bulbs for standard ones before your mot.