Okay, I'd been fed some mis information re springs and SLS, is there an easy way of telling if the ACE pump has been removed and replaced by an idler?
Get on your knees and look under the car drivers side between the drivers door and rear passenger door. If ACE is fitted you will see the pump attached to the outside of the chassis. If it has been removed all you will see is an electrical connector hanging down. Also as UP says, look in the front wheel arch and you will see the anti roll bar. If it has ACE it will have all sorts of hydraulic pipes and things, if it has been removed it will just be a solid anti-roll bar (the rear is the same but harder to see). If it has been removed there is a good chance the fluid reservoir will still be there as there is no need to replace it (just leave it empty).