Trading the NASDAQ and avoiding currency exchanges

[johnnyc62]

I live in the UK and have been trading shares on the NASDAQ for the last 3-months. My broker is UK based and holds my money in Sterling and then exchanges to US Dollars when I buy shares and then when I sell they exchange back to Sterling. I lose 1.5% - 2.5% per trade due to currency exchange rates.

Does anyone know how I could avoid going through the currency exchanges?

Thanks!