Multiple acceptance checkboxes

Hi,
I’ve created a membership form where there are 3 membership options and in turn 1 of 3 forms should be filled in to send an enquiry.

I have used a conditional logic plugin to show the relevant form which is working well.

For each of the 3 forms there is a terms and conditions acceptance checkbox.

When filling in any of the 3 forms and pressing submit, the form is not sending until all 3 acceptance checkboxes on each form are checked.

Can you suggest how i can make the form send if only 1 of the three acceptance boxes is checked please?

HERE ARE LINKS TO EACH FORM ON ITS OWN – EACH OF THESE WORK FINE:

http://sigb.org.uk/2019/full-only/

http://sigb.org.uk/2019/retail-only/

http://sigb.org.uk/2019/travel-only/

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