When did Jac Naylor join Holby City and what have been her best storylines?

Holby City SPOILERS: Jac and Kian held at gunpoint tonight!

Holby City SPOILERS: Rosie Marcel confirms exit for Jac Naylor after 15 years

When is Welsh crime drama Hidden with actress Sian Reece-Williams who plays Jodie in Holby City back?