changing currency in a spreadsheet

I have a financial spreadsheet that was designed in the USA but I live
in the UK. Is there any way in LO to change all the cells that are
formatted as numeric $ amounts to be the same format but using the
equivalent numeric £ format instead?

I don't think there's any logic in the spreadsheet that depends on the
currency, it's just doing numerical calculations on the values. But it
would be easier to look at if it was in £ rather than $ everywhere!

Cheers, Dave