It doesn’t really matter what currency the ETF/fund is denominated in, what matters is the assets it holds.
If the value of GBP falls 1% then the value of INRG will increase by (approximately) 1%. That is so the value of it’s assets is unchanged, but it’s worth more £.
If INRG had a lot of UK exposure then it’s value could be influenced by a falling £, but that isn’t really the case here.