Unless the item is now in the Sale and it wasn't last time, then assume the price is the same in British Pounds and any decrease in price is due to currency fluctuation, specifically the weakening of the British Pound against the currency you are looking at.

If the price is now higher then assume that the British Pound is now stronger against the currency you are looking at than last time you looked.

We only alter the base price - British Pounds / GBP - if we put an item in the Sale category.