OK thanks. I knew primitives came with default UVs but didn’t realise these persisted and evolved as you edited and added new faces to the mesh. A more logical implementation (IMO) would be to clear default UVs once you’d edited the mesh. So therefore I’d assumed that the pothead would have zero UVs and that’s why we needed to ‘create’ them. A more appropriate terms would be ‘updating’ the UVs. I guess this is just one of those things you need to know but I do at least know it now.