Hey fella dont shoot the messenger !!! you can buy a full kit for £850 which is quite a good price considering what you get for the money.and the ref handling it is their comments not mine...1 advantage would be improved suspension travel over standard and no bumps would be so harsh..
Hydrolastic suspension was supposed to do exactly that and the ride height could be increased to make it smoother.
I just don't see how softer suspension can improve the handling.
The best way to improve handling is to set the suspension accurately at standard ride height and solid-mount the front sub-frame. that all costs very little.
The OP said he wants to improve the handling and lowering it certainly won't do that.