GBP vs AUD

Hi

I need to convert some GBP to AUD at some point over the next 12 months but I�m having difficulty forecasting how this currency pair will perform. I usually look at the relative difference in interest rates as my main guide but both UK rates & Australian rates are forecasted to rise over the next 12 months. This would indicate that the exchange rate for this pair will not change much but I�m not sure whether this will be the case. Any advice would be greatly appreciated.