I noticed all of my downstairs lighting blew the fuse last night. As process of elimination I took out all the bulbs one by one to see if that was an issue. It still kept tripping the breaker. Even after all the bulbs were taken out it kept tripping. Went to bed to watch TV not a problem. In the morning the upstairs sockets had gone off in the night (on the same circuit as downstairs lighting) again by process of elimination with all the sockets but main breaker still kept tripping. I then switched off the downstairs lights on the breaker and it stopped tripping my upstairs plug sockets. So currently have everything but downstairs lighting. I presume I have an issue with a light fitting or a light switch. Any help or advice would we appreciated