In the past, if this happened, we took out our ancient fuse thing from the fuse board and replaced the fuse wire and put it back. But we had a new Fuse Board or whatever they are called installed over a year ago and have no idea how to check where the problem is. It was definitely all working last night, and I think this morning.
Any ideas? It's just 2 ceiling lights in the sitting room and one in the hall. The kitchen lights are fine 
TIA