*Pound gains slightly against US dollar Amid UK Retail Sales Report; pair now worth 1.5670

*Hong Kong dollar at 7.7525 against US currency amid CPI data

*Hong Kong April CPI up 0.6% on year, consensus 1% rise

*UK April retail sales up 0.9% on month, consensus 0.5%

*UK Q1 total business investment falls 6.8% on year