Iranian missile-range estimates and European defenses

What do the Iranians think their ballistic missile range is, and could they reach much of Western Europe?

The answer estimates that larger Iranian missiles could reach much of Europe if they work as expected, while emphasizing dependence on available defenses and favorable interception geometry.

The question compares reports about Diego Garcia with the distance to Western Europe. The answer estimates that larger Iranian missiles could reach places such as London if they perform as expected. This is an assessment in the discussion, without a demonstrated range or reliability figure in the passage. The explanation then turns to allied sensors and missile defenses, and the difficulty of obtaining domestic ground-based defenses at short notice. Aircraft such as Typhoon and F-35 are rejected in this exchange as substitutes for ballistic-missile interceptors. Ship location and the path of the incoming missile also affect what a defensive system can cover.