Was rather shocked to find BT hubs don't allow you to change DNS servers anymore and force you to use their own ones, so I can't properly setup adguard.
What routers are people using now that are reliable and will let me control my own network configuration
Pfsense is fantastic. Extremely flexible. I am contemplating switching to opensense when it's time for an upgrade (it's been running seamlessly for many years, but someday I'll need to).
Note that it's a router, not a wireless access point. For that I use a few Ubiquity APs (I forget the model).
pfSense is indeed fantastic. The best part about it is you can install it on pretty much anything, as long as you have a couple reasonably fast network interfaces and an okay-ish processor depending on the network load it will just work. Also has OpenVPN server baked in which is pretty cool