The reason he never sang it was because he didn't know the words. Whilst it may seem a trivial matter about a tie, it is more about, honour, tradition and respect, respect to make an effort to respect those who gave so much, and whilst he may not like royalty he is quite willing to take the Queen's shilling (our taxes) as his parliamentary salary for the last 30 plus years which has always been far above the working mans whom he purports to be one of, but of course he has never worked as a working man, but on that I stand to be corrected.
I have just got back to listening to an hours talk given by the Captain of one of our Nuclear Submarines, about life on board and their weapons systems, the latter not in detail, as most is still classified. He stated that no one on board wanted to turn the key, lift the lid and press the button, but it would be foolish to give up the one weapons system which is a deterrent to even the most powerful countries in the world that would comtemplate attacking the UK, especially in these uncertain times when Russia and China are building ever larger and more sophisticated weapons, and the spectre of North Korea doing the same. He says that Russia has some of the fastest submarines in the world, above and below water fortunately they are also noisiest and easier to track, whilst we have the quietest and why would anyone (Corbyn/Sturgen etc) want to give that up advantage. When the Nuclear Subs go out on 90 day patrol s, only six people know where their sphere of operation is, The Prime Minister, The Admiral of the fleet and four officers on board (the key holders). They are not allowed to make one transmission during the whole patrol, so if they sank on day two, no one would know for another 90 days when they would be classed as overdue. They can receive messages but cannot acknowledge them, one of the most interesting hours I have ever spent.