How to remove unwanted device from Heath App source?

For various reasons I ended up resetting my Apple Watch on Friday, and after doing so and setting it up again - I found that I now he duplicate Apple Watch's listed in my "Sources" tab in the Health App. When I click on my active Waych, it says to alter settings I need to go into the Watch App. Bit the inactive watch just says it's no longer paired with my iPhone. I contacted Apple Support and they had me reset my network settings, the watch itself again (Which resulted in another Watch being creared in the device list, despite me warning them of this) and restoring my iPhone. None have worked. There must be some way of removing a device frok the app? Anyone have any idea?