A complaint, not a parts verdict
“The temperature result changes” can point towards temperature sensing, control or a selected function. These are assessment areas for a oven; they do not identify a failed part on your particular Britannia model.
A fan oven running cold, a grill not heating and uneven cooking need different records. Mention each function you used normally rather than performing new tests.
The detail to keep with this complaint
Write down whether food undercooks or overcooks and if the display changes. Use observations already made during normal operation. Keep the setting and the result in separate sentences so they can be compared.
The cavity, mode and temperature selected
Which lights, fans or grill functions responded
The cooking result or point where power stopped
Describe the fitting
Explain what surrounds the appliance and how its normal user controls are reached. An integrated door, plinth, stacked position or high-level cabinet can affect access planning.
Which Britannia version is it?
Photograph a visible label around the door opening. For two cavities, keep the overall model and specify upper or lower oven rather than sending only a fascia photograph.
Keep the whole identification together with “the temperature result changes”. A manufacturer name, an approximate purchase year or a familiar fascia does not establish that two oven versions have the same internal parts.
Prepare the practical handover
If another household member will be present, leave the model, symptom description and contact information together. Do not rely on the person attending the door to reconstruct the complaint.
What is around the appliance?
Built-in, built-under and high-level installations involve different access. Say where the oven is mounted and leave cabinet fixings and electrical connections undisturbed.
Discuss the next step
Include your complete postcode and the Britannia product details. Suitable work, charges, appointment availability and parts are confirmed individually. For the wider appliance context, return to the Britannia oven guide.
Bring the details together
Complete only what you know. The notes remain in this page until you copy them; opening the booking service does not send these notes automatically.