So, having decided not to move home but to stay put and upgrade it, I'm going to be paying a professional to cable between the three floors of the property.
The logical stuff is what I do, so 2 cables from top and ground floors meeting in the home office on the first floor, 802.3ad bonding. Initially cables to run at a gigabit each, moving up 10 GbE later.
Anyone see any benefit in spending extra on 2 GHz pre-standard Cat 8? I'm thinking that over those distances high quality Cat 7 will be fine even to 40 GbE and being able to run a 20Gb LAG should be good for a long time yet.
Regarding the rest of the logical stuff the network will be a high powered wired router from Ubiquiti for WAN connectivity, a smart switch on each floor as backbone, additional switches as needed for port density, and an 802.11ac access point on each floor for wireless, though 2.4 GHz radio active on top and ground floor only due to lack of channel availability.