It's more likely that currency con version at this scale will be largely on paper accounting because 10s of billions of pound sterling is probably more than mos

It's more likely that currency con version at this scale will be largely on paper accounting because 10s of billions of pound sterling is probably more than most foreign currency reserves of countries much bigger than SoftBank usually carry. For example, a SoftBank subsidiary can probably take out huge loans from UK/international institutions and collateral/pay the loan with other assets in other jurisdictions. I believe this is how many companies avoid repatriation taxes: by taking out a loan in the US and making the payments to financial institutions overseas.