And of course the SCUD (with which some of us slightly younger brethren are more familiar) had much of its inner workings derived from the earlier SCUNNER which was pretty much a copy of the V2/A4.
As we used to say in the early days of the Space Race, it's not that the Russians (at that time) were better than the Americans, but that the Russian's Germans were better than the American's Germans!
[Edited to add]
Just finished (the ebook version of) Target London. Highly recommended.