Remove the front bumper (not as difficult as it looks although the radiator can can be changed without the bumper removed, it makes life a hell of a lot easier)
Jack both sides of the car up and support on axle stands.
Remove road wheels
Remove the bottom engine guard.
Remove the wheel arch liners. They're held in place with several screws.
Unscrew and remove the black bonnet latch cover that sits behind the grill.
Unscrew and carefully ease out the two side grills
Through the wheel arch,unscrew the three torx bolts on the drivers side that hold the bumper to the wing edge. Same on the passenger side but no third bolt... Instead, nearest the passenger side headlight is just a clip, this should unclip without trouble after eveything else is undone.
Remove the four screws that were under the side grills and the the five torx screws on the lower edge of the bumper.
Slide the bumper away and place it on a blanket to avoid scratches etc.
Disconnect the headlight washersand the fog lights connection blocks
Move the bumper on the blanket away from the car.
Disconnect the wiring to the radiator fans and resistor assembly.
Unbolt the plastic shroud and the aircon radiator. There are 8mm bolts holding it in place around the front and some 6mm bolts along the bottom edge of the radiator.
Unclip the pipes from the supporting rail underneath of the radiator
Squeeze the top and bottom of the metal quick release clip round the bottom hose connection to the radiator and pull it away. BE CAREFUL WITH THIS CLIP
Drain the coolant into a large enough bucket
Disconnect the top hose.
Use a trolley jack to support the bottom rail.
Unbolt the four 13mm bolts holding the rail to the lower parts of the chassis rails. (these can corrode so spray with plusgas an remove carefully)
Ensure that the aircon matrix is clear and that your not going to break the alloy connectors to it. Support the aircon matrix using some cable ties.
Carefully lower on the trolley jack the bottom rail radiator and fan assembly all in one.
Look for the rubber mounting bush at the centre at the top of the radiator, if it isn't there it may be still on the car, make sure you keep it safe as you will need it to refit.
Remove the cowling with the fan assembly and resistor housing at the top and refit to the new core, be careful with the cowling screws, they have a tendancy to snap so use plusgas again.
Refit in reverse and refill via the coolant tank
Let the engine get up to temperature
There is a bleed screw on at the top of the radiator on the driver's side. Unscrew two full turns when refilling and watch until there is a steady flow and re-tighten.
Make sure that the radiator fan kicks in at least twice while keeping the coolant filler cap off to bleed the top part of the system, top up until no more spurting from the top coolant tank ... Job done