My saved search has a bill in EUROs. However, when I run the search it shows me the values in GBP, presumably because that is the base currency. Is this normal behaviour? And there are is the Amount (Foreign Currency) which gives me the EURO value but none for Amount (Tax). Would I need to apply some exchange calculation in a formula field to get the EURO equivalent?

use the following setting in the results tab so the values wont be converted to base currency

Perfect, thanks. Is there a way to get the tax amount in the local currency at all?