Thanks so much Nibble!
so my issue here is:
1. I don’t have a large power draw headlight bulb - any suggestions on other options?
2. My totally confused GCE level electric knowledge is bamboozled at the thought I could put a positive and negative wire either side of a fuse (I’m thinking clip crocodile clip on one blade then second clip on the other blade) and somehow it would light up, am I imagining you said that? Where is the negative supply coming from - which lesson did I miss?!