Pulley fell off

[diddidave]

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Hi guys I have a pug 406 hdi executive estate, while driving this morning there was a burning smell and a big clonking noise so I stopped for a look, the drive/alternator belt had come off with this pulley (hope the picture worked ) can anyone give me any idea what the pulley is and if its a difficult job to fix
It's more or less the same size diameter as the lucozade bottle bottom I put in as a size comparison, hope that helps
Thanks in advance Dave

[Busman]

Looks like the tensioner or idler pully, have a look down the side of the engine and it will be fairly obvious where it came from.

[jasper5]

That's the alternator pulley.

[lozz]

+1 alternator pulley,

[madmadmax]

yep thats the clutch pulley from your alternator they can be replaced as a unit or you can drop a new alternator in

[diddidave]

Thanks for the replies, Love this forum already
Dave