Instant coffee in the hotel room was not so good, I tried to buy a Starbucks VIA in the supermarket.
Although I never bought VIA in Japan, but it seems slightly different to those of Japan according to the Starbucks WEB site.
-Japan version has five pieces in the box, while UK version has 7 pieces.
-Japan version's one peace contains 2.1g of Japan, and 2.3g for UK version
the price was £ 2.09. It says 180ml hot water for one peace.