Interaction between related products and cart

Have a screen showing a product and below it a list of related products.
On the right hand side is a cart module.

The product always displays correctly.
When the cart is either empty or the module disabled the related products display correctly.
Related product prices show as:

£6.78 each ADD TO CART

£6.78 ADD TO CART

if(isset($price->price_min_quantity) && empty($this->cart_product_price)){
if($price->price_min_quantity>1){

A quick fix is to put the following line at the end of the product cart.php view file.

unset($this->cart_product_price);