Strike whilst the iron is hot, so they say. However, whilst my soldering iron was not initially hot I did decide that having uncovered the Hornby duo of Class 58's I might as well DCC chip the motored one otherwise it would be several months before it got done.
First off was to get at the insides. Unusually the body does not separate from the chassis, you have to take the bogies out to get to the motor and wiring.
First bogie out.
Second one out. I used the 9v battery to test that the motor still worked! It did!
I tested the wiring with the battery which proved all was well. Most DCC chips will run on DC so the battery is a good way of testing without full DCC voltage which could blow the chip if the wiring was not correctly done! With that done the wires were coiled up and taped before being pushed into the body shell and the bogies refitted. Then the chip was programmed and the motored loco, with its dummy, was tested on the layout.