Indeed! With particular thanks to you, you were spot on regarding the alarm sounder (or so it certainly appears). Pulling fuse 9 drops the current draw from 100 mA to 15 mA. I shall be investing in a wiper arm puller (per your advise elsewhere) and delving below the windscreen shroud next weekend.

12V socket was a simple fuse issue and when replacedseems to be functioning fine.