I put up a picture of the new bike, but never put up a picture of my old one, and yet it served me well, and my son Toby as well, over many years. I owe it many hours of safe riding. So this is now remedied.
It weighs 12.4 Kg as shown, wherease the new one weighs only 9.2 Kg, as shown in the picture in my previous post. Such a big weight difference is really surprising, with the steel bike 25% lighter than the alu one. Surely this is in part because of the higher quality components, but it shows that steel bikes are not necessarily heavy.
By the way, I found this useful blog about Singapore cycling (cyclinginsingapore).