Hi Tobias
I figured out the problem. I installed the responsive plugin after I already had a table on a page. Then when I installed the plugin, it bypassed the css of tablepress.
I got to work by deleting all tables, reactivating responsive table press, created a new table and it worked fine. So in theory it will not work with existing tables.
It could be my theme that didn’t like it although the problem only centred around table press. Im just glad I hadnt done loads of work on my first table.
Thanks for your help but I thought I would share this in case anyone else had the same issue.
Regards
Paul