'Upgrading' to skinny tyres pointless for London commuting

On top of that, pressure varies with temperature, say tyre was pumped up with cold air from your cellar then let the wheels stand out in a hot sunny day - BAM.

There used to be a time I'd keep an eye on having the right pressure according to my weight and so forth. But since there is a general gradual loss of air and varying pressure...
who cares?
Just go max, sorted.

CSB WARNING

Couple of years ago in May we were on a riding holiday, and that day we did a bit of climbing.

I finished both my water bottles off on the way up, capped them and didn't think anymore of it.

Got to the bottom on the other side, and both water bottles had been crushed by the ambient air pressure- they were barely staying in the cages anymore.

Did make me think how many (relative) PSI the tyres had put up with at the summit, with the lower air pressure at the altitude we reached.

/cs