Smyth's abuse was first reported to the charity Iwerne Trust, where he had been chairman, in the early 1980s.
It asked for people to get in touch via itsor by calling 0800 555 111.
The reward would expire by 25 July, it added.Annabelle Goodenough, its South East regional manager, said: "We stand in solidarity with the Muslim community in seeking justice for the families affected by this devastating incident."Crimestoppers provides a pathway for individuals to share information anonymously, allowing them to speak up without fear of repercussions.
"It is vital that we work together to ensure that the sanctity of our loved ones' resting places is maintained."The cemetery is in the Three Rivers District, south of Watford, but is owned by Brent Council in north London.
Ch Supt Jon Simpson, head of Hertfordshire's Local Policing Command, said: "We are continuing to investigate every line of inquiry into this terrible crime, which we continue to treat as an Islamophobic act.
"We would like to reassure those affected, and the wider Muslim community, that we are continuing to treat this crime extremely seriously.""I'm a single parent... then I balance a full-time job as well on top of that."
Then there are the various methods of communication to keep across."There's too many ways that the school can communicate with you," said Ruth.
"We have a regular newsletter, then we have another sort of weekly newsletter, then we have another email update... then there's an app they launched this year, which I can never get into, one that's really stressful and then never remembers your password... then we also have Teams, then there's ParentPay... so it's just this myriad of communication."That's all before the parent WhatsApp groups.