Strong/weak relationship set ups are ripe for picking holes in those types of levels aren't they.
Yen was hot on Monday & Tuesday, as it still is today. On the flip side Sterling was losing favour, especially against Yen.
gbp/yen dropped through last week's low at 146.25 on Monday, followed by the previous weekly low at 146.0 on Tuesday. Clearly that's not the only pairing where that scenario has played out this week on Yen, but Sterling represented the highest probability set up given the relationship this concept is based on.