A few responses here:
1) Nudewalker's observation about going to work in dark not needing to happen in retirement: Whilst it's fairly early winter's days yet, on reading this it struck me that I wasn't feeling as winter depressed as usual. Maybe the warmer weather has an effect and maybe retirement and the stimulation of a new environment. I wouldn't say the usual 'winter blues' were not there - just not so noticeable at the moment.
2) Re childhood safety: Whilst I was brought up in a large town, we lived in a suburb and I have crisp memories of childhood, in a small posse of neighbourhood kids, going out on our own, climbing apple trees in a neighbours garden, digging to Australia in our back garden, baking potatoes on the embers of bonfires (my mum used to love making one), hunting frogs in a nearby waste lot and playing on an outcrop of sandstone in a lane nearby rubbing stones together creating a sand factory! Happy days. My kids were mollycoddled by comparison. I used to walk to friends houses and to school at 7 or 8 years old crossing dual carriageways with no pedestrian crossing and self & parents in no fear at all of some murdering paedophile preying on me or getting run over. My kids usually got taxied to their friends by a hapless parent and I don't have much memory of them having that sort of freedom to play, imagine and get grubby in nature that we did. Society has changed in half a century to being much more protective of children from many dangers more perceived than real, and maybe more risk averse to relatively small risks.
That said, my kids seem to have turned out with reasonably normal levels of decency, work ethic, intelligence, balance, principles, morals etc. etc. so I don't think they suffered by having more controlled safety in their childhood and play, but maybe they have less appreciation of nature and the aesthetic of natural things than their parents?
3) Be assured, Ian, that I will do everything in my power to engineer a rendezvous with you, should we be passing by on the river in the spring or summer!
John