OK Mark, if you're coming, bring the lithium battery, I'll bring the pump and fittings (weighs nowt) and we can include both the syphon and the BSC workings beyond the Hanging Death in order of group preference.
We're aiming to be on site by 10am, if you're early don't wait, but leave indication where we can find you if you go off the Main Level. We'll do same if you cant make 10am.
Sorry this is wandering off original thread :offtopic:; Tunnelmole, we will be at our usual muddy venue Thursday night, PM Colin for details. 🙂