Good to be back to something both interesting and doable after last week - on truly familiar territory as my college held a relevant collection. Currently nursing what appears to be a slow and muddy mind, I decided not to go near the candle flame last week, and I'm happy to wait until solution day to find out what I've missed. I'm sure it was wonderful/frustrating/maddening etc. Even took this one in gentle stages, and in better nick would have finished sooner, I think, but not without amusement and certainly not unimpressed by all the thematics fitted in. I found Wiki was as useful as the cited reference which I don't possess anyway. Regards to all and thanks to Brock.