We were already bullish on JPY (bearish on USD/JPY) as per our previous analysis of JPY. US CPI yesterday and US retail sales today didn't give any positive surprise, which is causing correction against gains of USD; so JPY is gaining.
You can see in last few analyses of GBP that we have recently been trading GBP as per Range Trading Style. Having seen the scenario for JPY as mentioned above, we deiced to sell GBP against JPY. Here is what we see technically and how we entered sell in GBP/JPY: