Ok, it's not a reputable news source, but this reddit thread describes a cognitively impaired young woman, being an informal 'surrogate' to clear her debts, now being chased for child maintenance so the couple can have extra cash to pay their mortgage. Makes me sick.
https://www.reddit.com/r/LegalAdviceUK/comments/14r6vw9/my_sister_acted_as_a_surrogate_for_a_couple_she/