Additional information provided below for comprehensive evaluation.
I see you are seeking added information. Team members thank you for your help. Let me add that in September 2007, I drove to a destination and then when leaving the vehicle didn't start up so I needed to have the vehicle towed to the shop, where the mechanic replaced the starter motor, starter core and fuel pressure regulator. During the same visit they also checked out and tested the alternator and battery and was told they were both in proper working order.
The vehicle drove fine until November/December 2007, when I needed another jump start and the mechanic re-tested the parts that were replaced in September 2007, in addition to the battery (replaced 2/2007) and alternator, which all tested fine. Boosted the battery once again, and the vehicle was fine for another 2 or so months (February, 2008), when the Discovery didn't turn over once again (click, click, click, click etc.)
Jump ahead to the original post, and here we are. I should also add that the vehicle is 100% stock, maintained on schedule and driven (up until the current situation, regularly.)
Need any additional info, will do my best to provide, since I am fairly new to posting in forums. Thanks.