Quantmod OHLC currency data

Hi all,
I am trying to back test a forex trading strategy but have been unable to get all the data I need. Using the R quantmod package and the getSymbols function I have got the daily Close prices of the GBPUSD over the last 5 years.
However I really want the Open, High, Low and Close prices for the GBPUSD in a data frame format.
I would greatly appreciate some help as I have read all the help files and examples I can find, but I can't get anything to work.
Thanks very much