I wonder if this could be our problem as we had a new Hager consumer unit fitted about 6 or 7 years ago and its funny but never thought about it until now but when an upstairs bulb blows the breaker trips but when a downstairs bulb blows the breaker does not trip and its the downstairs lights that we are having this problem with. But i still do not understand why the lights are dull downstairs when its raining or damp but are perfect when the weather is dry and fine.
I found this by accident at a property and it was a dodgy (first generation Hager) breaker.
Much to RF's disgust....
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