water pump, crank seals, driveshaft seals, clutch + Clutch arm bushes, clutch cable.

manifold to downpipe gasket kit

rad possibly, as for sensors see the FAQ on testing them and see if they're all good, no point throwing money away on them.

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need a part number? get on here - http://public.servicebox.peugeot.com

Bring on the Trumpets.

Use the loom and sensors from your old engine unless you have reason to suspect faults with any of them.

Definitely replace the cambelt, tensioners and water pump and consider a new clutch and cable too. That's pretty much it really, you may need an inlet manifold gasket if you're using your existing manifold.

Obviously inspect things as you reassemble and replace any seals, etc. that need it. Inspect everything behind and under the engine such as the PAS ram as that is significantly easier to change while the engine is out.

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Rich