Earlier quoted context omitted.
You'd be hard-pressed to find any other developed country than the US where it's not similar to that.
Great! Do you have an example of a form from your home country (assuming you don't live in the US)?
Unless you have a very special circumstance (e.g. you're a Lloyds of London name) you can file online through the HMRC website which does all of the calculations for you and is mostly just a case of entering a few figures from your P60 and P11D for the vast majority of people.