The Chancellor said recently that he expected that by 2030 the UK would be a bigger economy than Germany. If so, that would be the first time since the 1950s, as this chart above shows.
And here’s the same chart, in terms of GDP per capita (eg adjusted for population):
And finally, for some perspective, here is the same chart – GDP per capita – for the UK, the US and China (y axis is $ in 1990 prices):
All charts courtesy of the amazing Maddison project.