From fund factsheet:
Aims to track the Bloomberg Barclays Global Inflation-Linked 1-10 Year Index Unhedged USD, offsetting the impact of monthly variations of the index local currency vs. the GBP. The index is representative of the performance of inflation-linked government debt from global developed market countries with a remaining time to maturity between 1 and 10Y. The GBP-hedged share class offers the simplicity of a monthly currency hedge mechanism that is embedded in the investment product, representing an efficient solution to manage the foreign-exchange risk.