That'll be 863, 864 or 865 then IIRC. One of those might be with FSR, can't quite remember what I wrote in my notebook of my observations at Manchester Piccadilly on 24th January 2009!
Too right though, it's been many, many moons since Wessex Trains were plunged into the depths of history. It's interesting to ponder upon whether the improvements under FGW Local we see today would have been implemented under Wessex Trains, but that's an entirely different topic!
Well done on getting a Wessex Trains liveried 158, I miss seeing them down this way