WWI yes, WWII no.
But then again if the Brits didn’t get into WWI there would have been no WWII.
It is complicated but you’re right the reparations drove the Nazis to power.
You can't say that. WWI began because of the assassination of Archduke Franz Ferdinand of Austria. There still would have been a war. It remains to be seen if Germany would have won WWI if no other country entered that war against Germany. It was the Treaty of Versailles that was used as the catalyst by Hitler to wage war once again. He hated the French the most because of that Treaty, and he blamed the Jews for the loss and the state of Germany's economy in the aftermath of that war. If Britain hadn't fought in WWI, it's still possible that Germany wouldn't have been victorious during that war, so there would still have been a Treaty for Hitler to use as an excuse to use force on the rest of the world.