When you start, you have a Volvo with a sort of smashed left rear light. Here are the directions to get to the next destination:

Exit the area

Turn right

Keep going until you reach the tunnel then go through it

Stay in the left lane and use the sidewalk in you need to avoid traffic

When you have to turn go left

Take the right lane ahead and stay right

Keep going down this road until you see a yardie wearing a white and blue shirt with green pants who is guarding an alley entrance on the left which may be hard to spot, so you could just look for an alley

Get out of your vehicle and eliminate the Yardie then another Yardie might come. If not, continue down the alley till you come to him. Put him in the history books and keep going to where the alley bends. You can see two Yardie guards standing in front of a doorway. Pump their guts full of lead. You might hit some propane tanks behind them resulting in an explosion which will send them flying. If you don't know about any propane tanks, then look for them and shoot them when you go around the corner. Head for the entrance and kill the nutter. Enter the house and go down the hallway. Go up the stairs and blast the Yardie on the left and the same with the wanker that comes out of the room. Heal on the wall and 2 more tossers should come out and shoot at you. Cap them and finish your healing if you need to. Go steal the AK that one of them dropped when you capped them. When you're fully healed, enter the main room on this floor and murder the 2 Yardies near the back wall with your new AK. Now blast the sucker behind the boxes who is playing the music. Try not to destroy any speakers or equipment because the music will stop if you do. It's probably the best music in the game and it's pretty cool to leave on. Over by the big screen TV, you'll find a PS2 standing vertical with a controller plugged in. Maybe these Yardies were playing The Getaway earlier. Heal anywhere in this room if you need to, then go back to the hallway and go up to the next floor when you're done healing. Go to the door, but not into the room, listening to the person talking, and blast the fool in front of you in the next row, which may set some lab equipment on fire and an explosion. A Yardie with an AK should come to the entrance. If so, whack him. If you get whacked first by him or you just need to heal, then go back down the stairs and heal on that floor. When you go back into the drug making room, try to shoot some of the lab equipment first to make some explosions. After some explosions occur, go into the room and drop any survivors. There are Yardies in the next room, but just run in to the room and you'll beat the mission. Kill them for added difficulty.