ok, the quick fix is to install – https://wordpress.org/plugins/disable-feeds-wp/
So long as this is set to redirect to the homepage (in settings>>Reading), then is will redirect all feed requests to the referring page.
However, those feeds are still being produced, and I have found a filter to disable them completely.
‘bp_is_action_variable’
I’ll see if I can come up with some code for this later.