The photo is out of date, it hasn't been in those colours for some time.
I understand that the retractable gear was supposed to result in an increased cruise speed. It allegedly didn't, due to the extra weight involved.
I also believe that at least another example was built, but I'm not certain. Having flown the Bulldog for some time and seen this aircraft close up, it does look different; I would like to see it parked next to one for closer comparison.