I don't think a "funeral street party" is very tasteful!!
2500 people are going to the service alone, and the Police anticipate "huge crowds" in London along the route. What do you mean, dotty "just to be sure"?
I was there working in the dark in the 3-day week and the power cuts, something had to be done to break the stranglehold of the unions in the early eighties. I was in the Midlands at the time where industry was heavily unionised. I admired her for what she achieved, as the only woman in high level politics at that time - now, it's the norm.
Anyway, if the Queen wants to attend, and those organising it feel that it's appropriate, who are we not to agree with it? It is the passing of a highly influential political lady, whether you cared for her policies at the time, or not.