Thanks for your quick reply.
I have checked my backed up files and it looks like the previous version of WooCommerce Bulk discount was Version: 2.0.12 it is now running 2.1.3
I updated woocommerce from Version: 2.0.18 to Version: 2.0.19
I think it the original site pre update was running 3.7 when it was all working ok. Now its on 3.7.1
Hope that helps