Thanks Mike, Rick and Eric
Greg - thanks, and yes, Baader AstroSolar ND5. Standard colour is white, which is OK, but I prefer orange. I had a 72mm Nikon O56 Orange filter from my family's film days. In tandem with the solar film it delivers a warm orange image. The way I've constructed it, it's easily removed and re-fitted. Usefully, the 72mm cap fits to protect the lot.

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Thanks David. I believe we'll be neighbours up there. I'm keen to have a look at your setup too. See you and Al Wednesday week! Keep an eye out for four idiots and a camper trailer.