How many movies have Martha Williamson and Valerie Biggin collaborated on?

They have worked on 12 movies together! Their first movie together was Signed, Sealed, Delivered (2013) while their highest rated movie together was Signed, Sealed, Delivered: Lost Without You (2016). They have not worked together since Signed, Sealed, Delivered: To the Altar (2018). They are most known for their tv movie films together.