The UK can be one of the most disgustingly overpowered nations

The reason why? The amount of cores you can get, going monarchist can give you cores on the US, while going facist gets you cores on Europe by forming the EU, and obviously both paths can do imperial fed. And add on Imperial Constription, you'll have millions of manpower

You also start with one of the largest navies, if not the largest, and you have the potential to make a great army and airforce.

While other countries can be more powerful; I don't think many can be on the same level as the UK