My tumble dryer is one of the affected ones and I have now had an email to say that I will hear from an engineer in 8 weeks. Last week I decided to investigate the area below the filter (having had my dryer for 7 years). I do clean the filter when I remember, but have never looked underneath the filter. With the help of a torch and my hoover nozzle, I was able to remove several solid clumps of lint...... just like fire lighters! I know that the recommendation now is to clean the filters, but that is not enough if the lint has already fallen into the bottom of the machine, where it becomes compacted. Please take out the filter and clear the lint from the area underneath the filter. I think you will be as surprised as I was by what you find.