Adaptive Cruise Control (ACC) in an XJS?

Hi all,

Has anyone (successfully) fitted an after market (or other) ACC system to an XJS (a '95 in my case)?

I know there is the standard OEM ‘fixed speed setting’ cruise control, but has anyone found a viable way to upgrade/replace this with a more modern (radar controlled) ACC system, that can match the speed of the car in front?

I appreciate that given enough time & money anything is possible…but can this upgrade be done by a mere mortal!