I have mine installed and it is working perfectly. The item looks good quality and matches the old one in external appearance although the innards have changed somewhat, but with the notes enclosed by the supplier it was simple enough to connect up. The only noticeable difference is that the display is now white instead of blue which I find preferable anyway.
This is a spare part that Aga don't appear to even supply to British Gas. The part as supplied appears to be an Aga spare, works perfectly and looks good.