Drove my Land Rover Discovery 2 from Leicester to Derby yesterday. Got out at Derby and noticed a 'clicking' sound from the bonnet. Lifted the hood and found oil coming from what appears to be the ACE pump. Checked the fluid reservoir and this is very low/empty.

Is it likely to have blown the pump? If so, how easy is this to replace?

 

Replacing the ACE pump is pretty simple (remove serpentine belt, unbolt pump, remove hoses; installation is the same in reverse order) but make sure to check the fluid level in both sides of the reservoir. The other side is your power steering fluid.
You need to work out for sure where the leak is. Replacing the pump isn't going to help if it's actually a split in one of the hoses, for example.