Rather than a separate router and extenders/hotspots, you may wish to consider a combined mesh system. There are numerous to choose from such as Netgear Orbi, TP Link Deco M5, Linksys Velop or Ubiquiti Amplifi
All the devices mentioned remove the need for the SH2, they are complete systems with router and wifi access points. Wired connections will always be the most stable and fastest connection, but it is a trade off between that and convenience of wifi.
The SH2 is the BT hub. I don't use a mesh system, it was just a suggestion to consider.
I use the TP Link Deco M5 - a mesh of 3 has transformed performance round the fairly large old house. I resurrected the old ECI modem and put away my collection of HHs (3, 4 and 5).
Great I’ve just ordered it, I’m hoping it’s easy to setup, thanks for everyone’s help and support and everyone have an amazing Xmas and new year 🙂