To set the record straight, you need to differentiate between WSOp and Loadmaster (LM). Not all Non-Commissioned Aircrew (NCA) are now WSOps. Predominantly, it is LMs who carry out the duties of winchman/winchoperator or rear crew on helicopters. WSOps tend to fulfil electronic type jobs on Nimrods.
Take a look at:
RAF CAREERS
for the definitive.