Vauxhall combo 1.7cdti 2005 rattle on idle

i have a combo 1.7 diesel 2005 done 100000 mile been brilliant work horse regular service Has developed a rattle on tick over front the front it seem.
It drives well, starts well, no smoke, had clutch , any ideas please.

 

If only to rule things out, I'd be looking at the alternator pulley, water pump, power steering pump and the air con compressor (if fitted).
For the alternator, PAS and air con, we would run the engine with the drive belt off, just to see if the noise vanishes.
John

 

Don't know if they suffer from loose crankshaft pulleys - PSA cars do.

Peter