Thanks Dave,
Going from memory (the oven is in my son’s flat)there was something which could have been a stat on a metal bracket, not the button type as 54100 but small box shaped with two wire connections. It had a short projection into the oven near the sensor/probe location.
I was able to find this metal bracket in smeg parts but not the box type ‘stat ‘ its self. Could this be a modification or is this something else ?
Rob F