Inquired about this one before I bought mine. Still has stock ECU and the gent who was selling it told me it would only be £400 to replace... thought it best to leave that one for someone else.
I believe this is the same dealer that had the 'cheap' red M400 for sale last year. The salesman did a good job in putting me off that car when I went to see it. I'm pretty sure they have had this car for sale for a long time too