UK's RPI index remained in line with market expectations during the month of January, where the index rose by 0.3% over the monthly scale, from 0.7 percent, while on the yearly scale, the index rose by 5.1 percent from 4.8%, furthermore, the RPI index that excludes Mortgage interest payments, rose by 5.1%, higher than market expectations of 5.0 percent and the previous 4.7 percent.