Can one enter the UK with a valid UK entry visa on an expired passport of one nationality and a valid passport of another nationality? I would be grateful for any references or links.
No. You have to use the passport that is linked to your immigration status. Both passports (the valid and the expired one with the visa) must be from the same country. The combination of your other passport and your valid visa will not prove that you have entry clearance.
Source: Travel to and from the UK
You can use the valid visa in your expired passport when you’re travelling to and from the UK. You’ll need to travel with your expired and your new passport.
AFAIK this is common to all countries that allow entry using valid visa in expired passport with new passport eg USA.