Review of The Inspector Lynley Mysteries

I decided to watch this series again from episode one and I really enjoyed it. However I found miserable Helen annoying and then in the last few episodes she had a complete personality transplant when a different actress played her. Lynley meanwhile had turned into a misery but I didn't understand why bringing in another actress, presumably Helen one wasn't available, they bumped her off, so more Lynley misery. Havers was brilliant but they should have given her a romance, and an extremely pregnant woman officer ( Lisa Tarbuck) was unbelievable. The story lines were strong until the last few as Havers acted like the senior officer. It was an enjoyable watch but the plug was pulled like Foyles War because it was too expensive. However they bought that back, why not Lynley?