I just wanted to give a bit of feedback on Chips for the DCC Ready loco's I have tried a few chips in my 68 and they all worked the loco fine however only one chip worked all the functions out of the box without any remapping and that was the :
ESU LokPilot V4.1 54615
this has the Halo lights set to F5 so if anyone out there is just looking for plug and play I can confirm this chip works in that way.
I did also try the Zimo MX634D this needs remapping to control the Halo lights.
There maybe other 6 function chips that work but I only had the Zimo and the ESU 6 function chips to hand I did also try Bachmann, Hornby, Gaugemaster & DCC Concepts 4 function decoders, these all operated the loco and directional lighting without any issues but not the Halo lighting.