I don't see any debug info for your site so I can't see what plugin versions you are using.
Did you recently update to Types 3.0 and Toolset Forms 2.0?
If so, did you run the post relationships migration wizard?
It may help if I can take a look at your Form and see how you have this set up, if that's okay.
Let me mark your next reply as private so that I can get log-in credentials from you—you may want to create a temporary admin user for me to use that you can later delete. And be sure to have a current backup of your site, even though I don't intend to make any changes.
Can you confirm how you link to the form and where it is displayed?
If you set this up with the betas then there is nothing you need to do, except you should keep your plugins up-to-date (Types, Views and Layouts all have updates available).
I'm not sure what your intention with the [cred_post_parent get='id'] shortcode in the form is.
I can see that you have inserted the form to publish a child Lot directly into the template for the parent Programme posts, so I assume you expect when you visit a Programme post that the form should have that Programme pre-selected in the field to set the Lot parent.
You can do that with the value attribute on the relevant field set to the current post ID (i.e. the ID of the Programme post where the form is inserted), like so:
[cred_field field='@programme-lot.parent' select_text='--- not set ---' class='form-control' output='bootstrap' value='[wpv-post-id]']