How to add notranslate for currency symbols - woocommerce

Question

Does anyone know how to stop Google translate from translating just the currency symbol?

I have installed GTranslate to translate woocommerce site. It translates well - however it also translates the currency symbol from £ to Euro. I have serched and found many of the same answer to prevent the currency symbol from being translated.

It involves wrapping every £ sign with a span like, £ this is impractical, takes too long and may need to be removed at a later date.

I thought I would try via a filter in the functions file as mentioned on the woocommerce website (see below) However, it doesn't work - possibly Google is translating it after the filter?

add_filter('woocommerce_currency_symbol', 'change_existing_currency_symbol', 10, 2);

function change_existing_currency_symbol( $currency_symbol, $currency ) {
     switch( $currency ) {
          case 'AUD': $currency_symbol = 'AUD$'; break;
     }
     return $currency_symbol;
}

Any help or suggestions woul dbe appreicated, I'm a bit stumped on this one.

Thnaks in advance