Since 1 British Pound is equal to 141.164194038 Japanese Yens, we could say that n British Pounds are equal to 141.164194038 times n Japanese Yens. In other words, we could use the following formula:
Japanese Yens = British Pounds x 141.164194038
For example, let's say that we want to convert 2 British Pounds to Japanese Yens. Then, we just replace British Pounds in the abovementioned formula with 2:
Japanese Yens = 2 x 141.164194038
That is, 2 British Pounds are equal to 282.328388076 Japanese Yens.