Hey Dug! Your post got me curious so I looked into the actual value shift of your home over time: in 1955 1 British Pound was worth $2.80 US, as we all know at the time Gold was pegged to the dollar at $35/oz so gold was £12.50/oz.

Today, Gold is exchanged at £2340.48/oz.

£2340.48 / £12.50 = 187.24

100(%) / 187.24 = 0.534(%)

So the British Pound has lost 99.466% of it's value against gold over 70 years, or an approximate average of 7.2% a year (0.928^70 = 0.00535 (0.535%) value remaining).

Since you said you received an offer for just over 100x the 1955 purchase price, we can find it's current value lost over time.

£1635/£12.50 = 130.8 oz of Gold.

£1635 * 100 = £163,500 approximate current valuation.

£163,500 / £2340.48 = 69.86 oz of gold.

69.86 / 130.8 = 0.534 (53.4%)

So after 70 years your home can be exchanged for only 53.4% of the gold originally used to pay for it. Revealing a true loss of value of 46.6% over the last 70 years, or about 0.0089% lost against gold every year (0.9911^70 = 0.5348). 🖖🙂