Well, September 27th rolled around and the GBP was up up up, moving from 1.6030 to 1.6100.
You will recall that I bought a put option at the strike of 1.5915 and a breakeven of 1.5826. The premium was 88bps.
I let the option lapse and I made a trading loss of 88bps, which is the cost of the option.