Grabbing customer group prices for output?

Hi,

I was wondering if anyone knew how to grab the customer group prices?

For example I can output the standard price, I can output the special price using $product['price'] and $product['special'] respectively - If I edit both Product -> Special or Product -> Discount -> Default then I can grab the price and output it with $product['special'].

I am struggling how to understand how to grab prices for other customer groupds under Product -> Discount -> ... for example "wholesale" or any custom customer group.

I assume it lies within $customer_group['customer_group_id'] and $product_discount['customer_group_id'] but am unsure exactly and which module to load to load this information, eg; "$this->load->model('catalog/product');"

Any advice would be most welcome.