Meeting someone in the restaurant and not eating while the other person eats is rude. Also draws unnecessary attention to the pair on seemingly clandestine meeting.
Something smells like a rotten fish here.
I was not following story to the detail level, but BBC claimed that Police found some ingested objects in his stomach, too large to be ingested unknowingly.
Does anyone know what they were?
Sorry, I can't find the reference to that statement just now. However, we should take everything stated in the newspapers with a huge amount of salt. If you read the reports in the British newspapers, on the 19th when the story broke, Litvinenko was meeting with a female journalist in a Japanese bar. A couple of days later it was an Italian academic (male) in a Sushi bar.
Again, early on it was "definite" that Litvinenko was poisoned by thallium. A few days later it was suspected that it may have been radioactive thallium, whereas the day before yesterday thallium and radioactive substances were ruled out, according to some sources. And so it goes on and on....
BBC claimed that Police found some ingested objects in his stomach
I remember that too. The day after IIRC it was claimed that the shadows on the X-ray pictures were due to the ingested Prussian Blue, an iron-containing pigment given to Litvinenko to treat the thallium poisoning.