Stuart;
I don't see the video, only the associated audio (maybe you can retry posting to YT)...but from that clunk-clunk only, it sounds like the WaPu will soon be due for replacement...if you're lucky, it will start to weep coolant first, but if you're unlucky, before it even weeps coolant, it might launch its' shaft (with pulley and fan attached) through the Rad...that's bad day!
I'd order a replacement WaPu (not terribly pricey, OE units, with cast rather than sheet-metal impellers, preferred!) to have on-hand, and keep an eye on the area, watching for leaks...when leakage starts, there's no more putting replacement off. This is no major effort, but there are a few hints...let us know when you're ready for this operation.
Cheers
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