Right. This may sound like a stupid question but hear me out
How do I remove the wheels?
I've had a go at it today and three of the nuts are stuck and will not budge. Tried a bit of force but that broke something
Any help would be greatly appreciated
What broke? At a guess your locking key?
If it was a standard wheel but that made a crack or a squeak type noise that's normal if they have been on a while.........
If they are tight first nip the standard bolts up a fraction more about 16th of a turn but not the locking bolt this should reduce the tension on the locking bolt making it easier to remove then loosen the other 3 bolts..
Then Jack the car. Once in the air remove the 3 bolts fully
At this point the wheel should come off if not your going to have a fight on..... Under no circumstances rely on the supplied car scissor jack get it up on a trolley jack chock the other wheels and use axle stands ..
The aluminium wheel and steel hub / drum/ disc do a strange reaction called galvanic corrosion or cold welding a big hammer and a block of wood to tap the alloy from behind should release it
Coat contact areas with copper based grease but not bolt threads...
Invest in a torque wrench and a 17mm 6 point deep socket and tighten to 105 nm