Even if you had bought in all those moons ago, there was no guarantee your investment would have made money. Something to think on.

Only if you sold too early.

Perhaps I should have finished the 'if only':

... if only I'd bought £100 pounds worth back then, and decided to sell today."

Yes, but what if the value of your investment had gone down. The grass is always greener on the other side of the wall.

At that point you can always opt for the gold itself - an investment that never loses its value

Then they would have lost £100 hardly as stressful as missing out on £100k