I have also noticed that the price of both Yama 18 and Hakushu 18 have gone up quite steeply in the UK. Bare in mind though that these sell in the Yen18000-19000 range in most stores in Japan which is the equivalent of Euro150-160 and have done for years. Even dutyfree at Narita Airport Yama 18 is still Euro125.
So maybe this is a case of Suntory bringing European prices closer in line to domestic ones for these items.
Point to note, the Yama Puncheon NAS and Hakushu Heavily Peated NAS prices seem to have remained same. These sell for half the price of the 2 18YO's in Japan so possibly starts to make sense.

