"...secondhand tyres are almost worthless."
In my pauper days I only bought second hand tyres and on an appropriate vehicle (any ICE with a high tax band) I would now.
I got 30K miles out of the Toyos on my extra set of wheels.
Top tip for owners in the UK who get a "...nail in the edge of the tread, so was irreparable" -which all the usual suspects tell you cannot be repaired is make a visit to Ledbury in the West Dimlands if you are passing. Here be an Olde Worlde tyre repairist who can and will do a proper (legal) job on those pesky repairs (pm for details) [caveat: not all repairs declined by Kwik Cash can be repaired anywhere], [caveat2: there are other tyre places that can fix a tyre - I just do know where they are ].
I might get some all-seasons (perhaps two) for the other car as I have to get up before the sparrows a few times a year and drive my SO to work but being a rear wheel drive auto that car might be better off left on the drive (or just reversed to work like I told her) - what do we think?