Custom GBP Index L is a synthetic index calculated by using 7 GBP currency pairs:
GBP / USD
EUR / GBP
GBP / JPY
GBP / CHF
GBP / CAD
GBP / AUD
GBP / NZD
Custom GBP Index L reflects absolute value of GBP against 7 major currencies: USD, EUR, JPY, CHF, CAD, AUD and NZD
Custom GBP Index L chart goes up as the absolute value of Great Britain Pound goes up.