@frankietom how are you measuting speeds? The guarantee applies tomthecspeed test Sky run in the Service Checker in the My Sky app somfirdtly check that if you click on the spedd result it shouldcshow you the history and the guarantee which applies from day 10 as some connections take time to achieve full speed. This technically doesnt apply to full fibre but that is Sky's policy.
Full fibre normally delivers to the hub what you buy but rarely there can be issues but far more commonly the problem is wifi speeds in the customers home. If the speeds shown in the checker looks fine but speeds in your home aren't first consider if the hub is in the optimum position. Which is out in the open on a surface so the signal isnt being blocked by furniture erc. You may need a longer cable than Sky gave you to link to the ONT any new ethernet cable should work if that applies.
A two bedroom traditional home can be more difficult to network than a 4 bed new build as solid internal walls are a pain but you should get the same performance as before if everything is equal.
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65inch Sky Glass, 3 Sky Streaming Pucks, Sky Ultrafast + and Sky SR213(white Wifi Max hub) main Wifi from 3 TP-Link Deco M4 units in access point mode
