In reply to Iain Thow:
> I've maybe had a dozen (out of about 7000 hill days spread over 40 years).
7000 hill days is good going. I've been at it 35 years and haven't worked out an exact(ish) figure, but Munro days have just passed 900 and Ochils generally stand at 1500 or so. Even with other stuff I'd be surprised if my total is much over 4000, if that - and I'm reckoned to be out a lot.
> Galloway from Carnedd y Filiast
That's exceptional if you were indeed seeing Galloway - it's getting into Snowdon-Merrick territory and Jonathan de Ferranti (the Viewfinders bloke) would probably be keen to hear details.
> Ben Lomond from Blencathra (I think, certainly one snowy point beyond the non-snowy Southern Uplands)
I'm not sure that's possible. A few years ago I became curious as to whether Skiddaw and Ben Lomond were intervisible assuming no mega refraction, so I asked Grant Hutchison who has an interest in such matters and the calculatory nous to work things out. I can't offhand recall the exact figures he produced (I'll see if I can dig them out), but the answer seemed to be no at a more substantial level than I'd expected - it was something like both hills would have to be 100m higher, or one of them 200m higher, for it to work. And of course Blencathra is a little lower than Skiddaw.
Having said that, JdF reckons you can see an impressive amount of Lakes stuff on a very clear day from Tinto, including Wetherlam which is remarkable if true:
http://viewfinderpanoramas.org/panoramas/UPL/TINTO.GIF
The gaps appear to line up perfectly. So on that basis it does feel like Skiddaw/Blencathra from Ben Lomond can't be far off being feasible - but I trust my pal's maths.
> something that we thought was Donegal from Sgurr Alasdair
Could just about have been, but it's a push and a very long way. JdF doesn't give anything in Ireland from Sgurr Alasdair:
http://viewfinderpanoramas.org/panoramas/ISL/SKYE_Alasdair.GIF
but in the reverse view, from Errigal, he has a hefty chunk of Ben More Mull at 127 miles:
http://viewfinderpanoramas.org/panoramas/IRL/ERRIGAL.GIF
It'd be getting into 150-mile range to see the Cuillin, though.
Re great days, 23 July 2010 was exceptionally clear for a proper summer's day - it was Ken Stewart's second Munro completion and we lounged around on top of Carn Dearg in the Monadliath in genuine warmth trying to work out if we could see Skye. Some days it's hard to be sure just how good it might be because of where you are. I was up the Wrekin on 7 Oct 1997 and it was like everything was being seen in high definition, but whether that would have translated into 120-mile views from higher summits I don't know.