Lights not working - no fusebox problems

A light blew in our utility room and I replaced the bulb accordingly. Still no lights at all in this room - checked the fusebox and nothing had tripped.

There are now two roof lights not working (usually from the same switch) and the toilet light (different switch). Guessing that they are obviously on the same circuit - any ideas on whats wrong - greatly appreciated.

With the power switched off you will need to look in the ceiling rose for each light, I would suspect that there will be a loose connection on either the live or neutral that loops from one light to the next. If you cannot see an obviously loose wire, then you will need to be able to test for voltages, preferably with a multi-meter. I would suggest you start with the one closest to the consumer unit. Alternatively if there are only switched live & neutral in each ceiling rose you will need to find junction boxes or connectors in the switch boxes.