Hopefully someone can help me with this - its doing my head in!

I have a formula which is supposed to work out the next working day a
certain number of days after an invoice date. So far so good and I use the
following:

=WORKDAY(D2+I2-1,1,'Holiday Range')

Where D2 is the invoice date and I2 is the number of days after the invoice
date.

However, I also want the Holiday Range to vary depending upon the currency
which is located in F2. The currency will be one of three - GBP, EUR or
USD.

Can anyone with a fresh brain help me with this.

TIA, Andrew