Ok, back home
Tried the X5 this morning after it was left sitting for 12 days

Check Battery Voltage - 11.7v

Turn key, Dash lights up, Vehicle cranks slower then normal (12days sitting), but starts fine.
Reverse vehicle out into driveway, test Charging current (14.1v at Battery Terminals)
Test every fuse in rear, right side compartment (all good)
Drive vehicle back into garage, turn off. Try to restart, no dash lights, No start.

The Mrs also noticed the Reverse Sensors were not working either
(something i hadn't noticed, for what its worth)

Wait 30minutes

X5 starts again
Turned off
Tried to start again, dash lights up, now it cranks over fast but No Starting.
Does this for 2 attempts

Remove key completely, re insert, turn, dash lights up, it starts

Turn off
Now won't even restart or crank over.

SWAP BATTERY for a another

2 Non Starts
3rd try it starts.....

Every time it starts, it still has the same warning lights on the dash.

Refit the first Battery, now it will not start after 8 attempts, leaving the vehicle for 1 hour etc.