Hey, thanks for the analysis Bobsta
I suppose what I was driving at was this would be the limit at which I would definitely stop buying, as per the OP's original question To continue buying after this point would be to lose money*. At any point up until the ratio goes to 1, I would be in the money as it were. I agree at the point the ratio goes to 1 then the value of the gold equals what I paid for it (obviously )
Good advice, thank you I should add that once the gold price resumes its upward march, I would then resume buying. The only time to stop (perhaps "pause" would be a better way to think of it) would be at the "ratio of 1" point
* but would still mean accumulating more Au (I agree with Wren below, value in the temporaray value of £s is perhaps not the best idea).