It's a lamp that often is the only one on in the summer evenings, and probably attracts moths and the like, and it seems on investigation that there's a fair few got into it, probably then got it hot and boom! (although oddly the bulb was fine!)
Anyway, wanting to fix the lamp, took it apart a bit and found that it was not as expected, and pushes together as opposed to being a screw in fitting. I've no idea where to get a replacement, or what it's called to Google it Anyone able to advise based on this photo? (ta!)