Now, I should explain that at this point it was getting really dark (because of the thunderclouds and the time, being after 10 o'clock as it was) and I kept missing the lightning -- as in the photo above -- but most of all the thunder was still far away and I didn't see any lightning branches. All that was happening, apart from hearing the thunder, was the clouds being illuminated by it and that's what you can see here. It's not the sunset as you might expect, but lightning colouring the clouds pink. The orange in the bottom left corner of the last photo is sunset colours, but the rest, from the horizon up, is all lightning.
After these photos where taken, the thunderclouds blocked out all that was left of the twilight and the thunder didn't seem to get closer so I gave up. You can even see it getting darker in the photos (where the last one is taken about 9 minutes after the first one). The thunder, however, didn't get close until the middle of the night. And at that time I was trying to sleep and not in the mood to try and capture lightning on camera.
Sorry about the telephone pole, by the way: I was sitting indoors taking these photos from the only window facing the thunder so there wasn't much I could do to avoid it.
So to conclude: lightning photos is something I need to work on, but I doubt I will. I'm not so fond of thunder that I'll go outdoors during a thunderstorm just to get some so-so lightning photos. I'll just keep admiring the photos taken by pros instead! Better to just sit back, feel save indoors and look out the window just enjoying the equally fabulous and terrifying view. If you have an open skyline, a thunderstorm can be awesome to watch (provided it doesn't get close enough to make you scared about it striking the house).