A lot of 165s have strayed onto Oxford services this year. I've filmed 7 165s on Oxford/Worcester services this year and there have been many more. Seems like GWR are having some problems with their Intercity trains
We all know a 350 as any other train ages and grows up , and part of that is the slow change from what might sound simolour to a bycicle horn to something known as a Nathan K5la horn , and in the transition years it can be very difficult to keep an exact perfect pitch as the horn cords grow , sometimes not perfectly evenly with some finnishing erlier or later