3 is fairly straightforward:
It is probably best if you don't have it angled at 45-degrees, especially not if it is a black Swastika in a white circle on a red background or adding lightning flash decorations to it.
Although, if you live in Donacaster, you might try to claim it was all a misunderstanding
(As an aside, this is so much more OTT as a Nazi flag than the usual ones - containing a skull and the SS flashes as well as the Swastika)
However if you have, say a golden swastika symbol at 90 degrees, next to a Bhudda, and maybe some elephants or prayer flags, you might be able to get away with it.