With compliments to whoever posted this in another thread. All I'd add is that if you don't want to split/damage your trim, a trim/panel remover is a good investment.
Blade
First, take the cap off the rear wiper and unscrew the bolt holding the wiper on.
Then hold the wiper tight at the bottom so it doest feel like your going to snap the wiper off, and push/pull anti clockwise, you might have to give a good tug then should just screw off.
Open your boot and remove the inner lower plastic panel opposite side to where the wiper was joined ( I managed to get my fingers behind the panel up near where it joins to the top plastic panel and tug it firmly all the way round unpopping the plastic out)
You will see the wiper motor held in with 3 gold coloured nuts. disconnect the elect plug 1st, makes it a little easier. then remove the 3 bolts and the wiper motor will come off.
-To fill the hole where the wiper was, i used a 25mm rubber grommet from b&q/wickes. and it plugged straight in. perfect fit!
Squirter
Remove the hose linked to it from the top of the inner boot. It's between the join of the boot and the car. Remove the 4 inch hose linked between the hose from the car and the squirter and fit is back the opposite way around. the hose has a one way mechanism so the water can only pass through one way(there is a little arrow on it) once you placed it the opposite way round, no water can get through.
Then you need to get some thin pliers and poke them up though the hole near the squirter (from the inner side of the boot) There is a little bolt there. Squeeze the bolt and push up and the squirter should pop out the top.
Put a 20mm rubber grommet from the outer side of the car in the squirter hole and use black silicone to secure it and prevent it from leaking. Put plenty of the silicone under the grommet so it would fill the hole underneath for extra strength and to prevent water from getting in.