have a look at the engine in this thread:
http://www.tigerstyle.co.uk/poloforum/v ... hp?t=17895
Now, on the right hand side of the silver rocker cover (the one with three allen bolts and the oil filler cap) is the distributer - the metal cylinder attached to the end.
Out of the end of the distributer come 5 wires, called HT leads. Four of the leads go to the back of the engine (through some plastic casing). The spark plugs are attached to the end of the leads, screwed into the cylinder head.
What you'll need to do to take them out:
1. remove the air filter cap - pop the clips all the way around the air filter. (in the pic they're using a cone filter - if you've got a standard one it will be a big black plastic disc shape, and will be much bigger.)
2. remove the air filter. It's a doughnut shape filter that's under the filter cap.
3. remove the rest of the filter housing. You need to undo 3 allen bolts and three nuts. Be careful not to drop the nuts when you take them off. tools: allen keys and a 10mm (i think) socket.
4. remove the earth strap (thin and wide strap around the air filter), the oil breather hose (around the back of the filter, this just pulls off) and another, very thin hose from under the filter.
5. Undo the plastic hose/tube air intake from the left hand side of the filter. It extends across the left hand side of the engine bay. find a screw that suits!. tools: medium size screwdrive.
6. you should now be able to see the HT leads. you should be able to pull the leads off the top of the plugs. (nb, if you can't, you might need to move the plastic HT lead casing to get a bit more room for the leads. You'll see what i mean when you get there).
7. Unscrew the plugs one at a time. Tools: spark plug removal tool (not sure what size).
Hope this helps! Sorry if it's a bit long winded, i've made it as much of a walk through as poss. Let us know how you get on. It's really not as difficult as it sounds as you read this.
Oh, and take plenty of care when you screw the plugs in again, you don't want to mess up the metal screw threads in the cylinder head!