A constituent has complained to me that in the past few months, more and more trains are appearing on the Northern Line which have very hard seating. He states that the seats fail to meet the basic and obvious requirements of comfort and safety and that they are not only extremely uncomfortable, but also dangerous to one's health. He also complains that there are also other design defects in TFL carriages, in that (a) The new Victoria Line trains have conventionally sprung bases, but have flat upright backs that provide no lumbar support, (b) that hard seats are a feature of the Jubilee Line carriages and (c) In Northern Line carriages, the volume of announcements inside the carriages has been increased and now ranges from normal to ear-shattering. When he complained to TfL all he received was a bald acknowledgment. What will you do to investigate these issues and also to ensure that people get proper replies to complaints?