Excluding tax price in products not updating when using combinations and specific price

[Garden Light Shop]

Hi,

 

I have been trying to fix this for two days now... I have read various threads on similar issues but everything I have tried hasn't worked.

Basically I use the following in product.tpl to return two prices exc tax and inc tax:
 

excluding: {convertPrice price=$product->getPrice(false, $smarty.const.NULL, 2)}

including : {convertPrice price=$productPrice}

 

Everything works fine.

 

If I add a specific price everything works fine.

If I add combinations everything works fine.

 

If I add both, the excluding tax shows £0.02 for every combination yet the including tax price continues to work.

In fact the excluding tax shows for a second before switching back to £0.02 which would lead me to believe this was something in product.js. I can't find anything though.

Anybody got any ideas to point me in the right direction?