I can assure all that the Wessex definately did use depleted uranium as a rotor balance weight. Page five of
http://www.wise-uranium.org/pdf/duemdec.pdf
Reed C. Magness, “Environmental Overview for Depleted Uranium,” CRDC-TR-85030 (Aberdeen Proving Ground, MD, October 1985) 10-12; In a response to Mr. Duncan Smith in the UK Parliament on 2 February 2001, Mr. John Spellar, UK Minister of Transport, stated that DU is used in balance weights in the Tristar helicopter, Wessex helicopter, and C-130 aircraft
The following item, though it doesn't state the helicopter type, refers to the transfer of Wessex helicopters from our Navy to a civil organisation, page nineteen.
Readers would be aware that the Historic Flight Restoration Society (HARS) recently won the Tender for acquisition of what was once the RAN Historic Flight.Some of the HF airframes have been withheld from release, pending examination for potentially radio-active material (such as depleted uranium in rotor blade tips), but others have been released and HARS volunteers visited Albatross on 10 December to view them, and move what could be moved.
https://www.faaaa.asn.au/wp-content/...yByJan2019.pdf
What is the reason to balance the tip of a rotor blade
For the same reason you balance your car wheels.
https://www.aviationpros.com/engines...balance-theory