If she were (as those who knew who said she would have wished) having a quiet, private funeral in a dignified location, attended only by family, close colleagues and maybe one invited photographer then political demonstrations of any kind would be unthinkable.
Someone would probably still think about them, but they would be unthinkable.
As it is, her funeral is being orchestrated by the Tory party as a Tory party political event to beatify a former leader of the Conservative Party.
Falklands themed funeral? Falkands themed funeral? With some Chalky White jokes from Jim Davidson, a revue by the Black and White Minstrels and a special celebratory episode of Jim'll Fix It, I shouldn't wonder. The policing of the funeral has actually been code-named "Operation True Blue".
So the question is not "Should we desecrate a private, religious event by holding a party political demonstration?" Of course we shouldn't. I understand that after his assassination, Osama Bin Laden was given as dignified a funeral as possible, according to the tenets of his faith. Myra Bloody Hindley was given a quick, dignified send-off in a municipal crem. [*]
But that is not the question. The question is "Given that the Tory Party has already decided to take what should, indeed, be a private, religious event and turn it into a party political demonstration should the Left a: do nothing or b: have a demonstration of their own to show that no, actually, there is NO consensus, NO unanimity and that T.B.W is NOT the best loved English person since Churchill."
Only a complete shit would march into Canterbury Cathedral and disrupt a solemn mass on Easter Sunday because he doesn't like the political views of the Archbishop of Canterbury. But if the Archbishop of Canterbury announced that he was going to hold a special mass to pray that all members of the banking profession should be damned for eternity, followed by the ceremonial excommunication of Sir James Crosby, I think that would probably be the wrong moment to say "I don't think it is right for the Banking Community to complain about what is essentially a private, sacred, religious event." The more strongly the Left threw up a police cordon around the Cathedral and said that dissent had to be prohibited because there was no dissent and everyone agreed with the Bishop anyway except the Right who don't count, the more important it would be for some kind of counter demonstration to be hold.
The whole point of the posthumous exaltation of T.B.W is to manufacture a false consensus. Love of T.B.W and support for the Conservative party, like love of the Queen and support for the Monarchy are not political points of view, they are a base-line neutral position which all British people agree with. [**] If you don't love the Queen, T.B.W and the Tory Party then you aren't British. Once we ignored all the dissenting voices then 100% of those questioned agreed with us. There will be no art, no science, no literature, no enjoyment, no laughter, but the laughter of triumph over a defeated enemy. There will be no love but the love of Margaret Thatcher.
[**] What is the British equivalent of Motherhood and Apple Pie? "The Church of England and Steak and Kidney Pie, perhaps?