Japan spends 13% of the world's total Pharma R&D while the UK spends 6% less (source). Are there any reasons existing within the health system of Japan which allow this to happen?
The UK has a GDP of $2.91 trillion (PPP). Japan has a GDP of $5.42 trillion. (source).
The UK spends about 7% of the world's $1.36 trillion on pharma R&D, or about $95 billion. Japan spends 13%, or $177 billion. (source)
So the UK spends 3.26% of GDP on pharma research. Japan spends 3.26% on pharma research. There is no significant difference in spending between the countries.
This is in contrast to the USA, which spends more of its GDP on pharma research, and China which spends significantly less.