Torx bolt - clues on where has it come from?

[054812]

Hi,
I found a Torx bolt on the drive the other day and believe it has probably vibrated itself loose from our 2006 Alhambra (115bhp manual).  I believe it is a T45 head and overall it is about 25mm long with the remains of some blue threadlock on it. It has a captive collar/washer built in.
I've had a quick look around the car but can't see any obvious locations for it. I've yet to take the undertray off. Any ideas on a likely home for this?

Thanks
Neil

[Mirez]

Possible engine mount to chassis bolt. I can't think of many others thay are torx and have a collar...