Failed gasket

Hi my ovens around 2 years old. I needed to change the oven light bulb the other day and found out that the gasket has perished. Ive tried contacting support fir a replacement gasket, but no answer.

Ive read these pages that someone has used a food grade high temp silicone to repair, but as that is not an approved part im hesitant to perform that task.

Anyone from support please help?

Im from UK.