Description has dissapeared from products with variants

The description seems to have disappeared from all of our products that have variants.

It is still there for the simple products.

I think this must have happened with the update to the latest version of Marketpress, they were showing before.

Simple product with description showing: http://www.smartschoolcouncils.org.uk/products/how-do-i-present-my-plans-a2-poster/

Product with variants: http://www.smartschoolcouncils.org.uk/products/smart-school-council-masterclass-cpd-for-teachers/