The British Empire tried to steal Crimea from the Russian Empire in the 1800’s.
That might be where the Cold War started.
The British never had territorial ambitions in Europe. I think the Crimean campaign was more complicated than that. Here is a good summary of what lay behind it. It is reasonably easy reading, with only a few hard words:
The Crimean War broke out on 5th October 1853, a military conflict fought between the Russian Empire on one side, against an alliance of Britain, France, the Ottoman Empire and Sardinia. The complexity of the war meant that it was fought on the grounds of various reasons by different parties, as everyone had a vested interest in the region.
The outbreak of violence arose from various factors, including the issue of Christian minority rights in the Holy Land, the overall declining Ottoman Empire leading to the “eastern question” and a resistance from the British and French to Russian expansion. With so many factors at play, the Crimean War proved inevitable.
In the years leading up to Crimea, competition between nations was rife, the prize being control of the Middle East, which was enough to ignite national rivalry between France, Russia and Britain. France had already taken the opportunity in 1830 to occupy Algeria and the prospect of further gains was enticing. The French Emperor Napoleon III had great plans to restore the splendour of France on the world stage, whilst Britain was keen to secure her trade routes to India and beyond.
It was the Russian Empire that had the territorial ambitions, then as now [my italics].