In 2013 I wrote an article for LMS Review on the then new Bachmann 4F. One of the two I purchased was 43875 which visited the Bristol shed.
My intention was to convert it to P4 for the layout and a couple of years ago I purchased an Easi-Chassis kit from Brassmasters and started the conversion. This ground to a halt early in 2017 pending a decision on which method of pick-ups to use. Over the past week I have completed the project - not the easiest conversion to attempt - and this afternoon the 4F was tested on a freight on the layout.
Here is a video of the test freight train. Especially for you John:-) Thanks to Morgan for the loan of the stock.