Thanks very much; once I could see that the interior cabin lights were on the same fuse as the cargo (boot) light - which was working - I checked the bulbs and found that all 3 had failed. I didn't check before as I didn't expect THREE bulbs to have failed suddenly, and I was nervous about prising out the plastic lenses. Now to get some more bulbs; I wonder why they failed, and hope nothing else was affected.
Thanks again,
Dave.