They used email?
They sent legal documents including "details relating to physical abuse and included the identities of the child's mother and witnesses" by email?
In the UK? A country where Phorm, Vodafone, Bluecoat, BT, Yahoo, Experian Hitwise, Huawei, TalkTalk are criminally and illegally intercepting private/confidential unencrypted telecommunications?
That in itself ought to be grounds for a switft belt around the head with a LART.