We're about to move into a house with a separate converted 'studio' office in the garage, which is a separate building. It's just one room, not a full-on annexe, but we'll use it for home working, so it needs good wifi. The main house has full fibre. In the past we were on BT wifi in our current house (not full fibre), which we found good but expensive. We switched to Sky, which was cheaper but crap by comparison (far slower and more drop outs). Current owners of the new house have BT Halo, which provides extenders but looks expensive.
Any recommendations?