'09 S - Turns Over - Wont Start
 

Just about 1,000 miles ago, replaced timing chain, ignition coils & plugs. sitting at 76k miles. Not quite sure where to start. Parked the mini in the garage and sat for a few weeks. Battery was strong in turning engine over, would not fire. Not sure if a simple change of the fuel filter would fix the issue. There have been no issues with idle / hesitation, etc. any thoughts appreciated.

Spark, air, and fuel are what make cars run so those are areas to start.. What did the battery read at when you tested it? All sorts of weird stuff can happen with these cars with a bad battery, even ones reading at 12/13v.

Can also read over this to maybe go over the steps to make sure you didn't miss anything: https://www.pelicanparts.com/techarticles/MINI_R56/90-ENGINE-Turbocharged_Engine_Timing_Chain_Guides_Replacemen t/90-ENGINE-Turbocharged_Engine_Timing_Chain_Guides_Replacemen t.htm