I don’t have a source for those exact numbers but I’m sure you can ask google or chatGPT about it

value_now = value_start / ((1 + inflation_rate) ** (year_now - year_start)) So for, 100k from 2006 to 2025 assuming a 2% inflation rate, we get 100_000 / ((1 + 2 / 100) ** (2025 - 2006)) = ~£70k