Are the Sudanese familiar with what the British did to Dresden???

That is exactly what the British should do. But to answer your question they do know what the British did to Dresdon and even to the Argentinia when they decided the Falklands were theirs, just like Bin Laden knows what the Americans did to Hiroshima and Nagasaki. The problem is they also know that the western world is growing weak and no longer has the constitution to do what must be done. There are groups within the western world which in their illogical drive for political correctness are trying to destroy the western world. 40, 50 years ago when we had strong leaders Sudan would have never tried this stunt now the whole world believes the west is a paper tiger.