Thanks for that - it was the bulb in the bathroom which is a halogen down lighter that blew and made the fuse blow. I have taken out the 13amp fuse and will get a 5 amp tomorrow.
Ta
I have just replaced a 5 Amp fuse with a 13 Amp fuse in a spur fuse box which controls the lighting circuit upstairs in my house - is this safe?? The lights are working.