Calendar-wide entry cost rose sharply in real terms
The real cost of the cheapest way into a Grand Prix rose 53.4% between 2017 and 2025 (nominal +105.4%) on a calendar-wide basis.
Supporting evidence
Season-level index built from the cheapest verified entry price at every race with usable data, 2017–2025, re-stated in 2026 GBP via UK CPI.
Interpretation
On the calendar as it actually existed each season, going to a Grand Prix has become substantially more expensive than general inflation.
Caveat
Coverage is thinner for 2017–2022, and the 2020 point rests on only three races with public ticket sales.