after picking up my 2011 range rover i couldn't connect my phone to the bluetooth, anyway i looked at the module in the boot & strangely it was unplugged, i plugged the grey connector in but seems like something is missing.
Yes, but if it has been bypassed the module is likely not working. The MOST "loop" is just that. If one component fails in the loop all sorts of issues pop up due to lack of communications. That's the reason folks either purchase a bypass or use a stick pen tube to join the optics and restore communications within the loop.
Fortunately replacing the bluetooth module is simple and you can remove the bypass to restore operation with a known good second hand unit.