Jason wrote on Instagram:
"Decades ago Helen and I auditioned together for a film. I came home and said to Emma "I think I've just met the greatest actress I've ever seen." After years of watching her mesmerise audiences I don't think that any more...I know it. Luckily, I eventually found out that she was also scabrously funny, shockingly naughty and with an empathetic heart the size of a planet. As continually starstruck as I was on the Harry Potter films, being screen-married to and giggle with the great Helen McCrory will always be a highlight. Her proudest achievement, though, was building and loving the family that was her bedrock. They've lost so much and I send all my love to Damian and the kids. xxx"