Keep the "want" and "need" in balance. Prioritize reliability over speed.
If the Wi-Fi environment is challenging I would look at products like U6 In-Wall. This is a wall plate style AP with 4x extra LAN ports for wired devices. One AP may cover a room or two for Wi-Fi and provide wired connection to local devices. It has GbE ports, but nothing beats the wire for reliability.
Gigabit network will bring down the costs significantly. Matching gateway is £79.00 only (UCG-Ultra), matching 8-port switch with PoE good for 4x APs is £85.00 (USW-Lite-8-POE). If you don't need LAN ports APs start from £79.00 (U6-Plus). If you do need LAN ports the in-wall APs are £140.00 (U6-IW).
Good luck!
Thanks, will do some thinking. I do need LAN ports, but only for one room and I've already set all that to go into the nearby closet where the little 'network cabinet' (A slim wall mounted BESTA with a glass door) resides. I've got a modem and the ASUS router in there. TBH one of the reasons I liked the BE88U was all the 2.5Gb ports because that would save me from also getting a switch for things like transfers between my PC and NAS. Of course, I'll have to split all that up now.