Only show applicable product options.

A slight problem has come to light on a client site.

Because various product sizes are available in different colours I have created a lot of variations. However all the colours are always showing on the drop down even when they are not available.

For example if you select 2.5m x 2.5m they are only available in two colours, however all colours show, even though it does not allow you to add the product to the basket.

I think this will be really confusing to customers, as they would need to select each colour until they get to the one that is available.

Does anyone know of either a way of overcoming this with the stock WooCommerce config, or if there is a plugin available for product options that can deal with it?

The page I need help with: [log in to see the link]