Thanks for the information! That one was made during the 21st week of 1988.
Neither my FL1123 and Z9191T seem to make it up to 40 degrees on programme 'G' Non Fast Coloureds either, the temperature on the door glass feels more like 30 to me. Yet I'm sure similar machines I used years ago didn't have the same problem. Perhaps age affects the thermostat somehow. They use two separate dual thermostats. The first is for 30 and 40 degrees, and the second is for 60 and 90 degrees. In fact if I put the Washcraft on the wool or silk programme it just washes forever without moving on, so clearly something isn't right somewhere.
My 1989 Jetsystem uses a variable thermostat alongside a single fixed 40/90 degree stat which seems much more accurate.
I might change the 30/40 thermostat on one machine, just to see if it makes a difference. I need some sealant as well though, as I don't want it leaking!
Tom