I've been suspicious that both ovens in my Neff U1661 are no longer
getting to the set temperature so have just checked with an oven
thermometer - it shows 20-30 degrees colder than the setting in each
oven. I'm going to try the thermometer in another oven ASAP but I
suspect it's telling the truth because we've had some under-cooked
things recently.
Are there any calibration adjustments on the temperature controls?
Any suggestions on what to check?

(I've asked this on UKwhitegoods too)