You can get thoes thermostats which chainge colour with different
temperatures, diferent numbers light.
Can you get one in the 80-110 degres C rainge.
On Stags, you shoud always fit a coolent pressure gadge, it gives a much
better indecation of boiling over than temperature.
Spit should run at about 92 -98 degrees C at normal, it'll be over 100 at
3/4. The colent boils about 112-120 degrees C.
To me your car sounds about fine. Swap your fule with temperature gadge,
and see if they read the same.