Thanks, yes blue lines are two wired bt pods, one in bedroom isn't.If it was me, I would replace your BT nodes (the blue line means they are wired I hope) with Asus routers in AP mode. One in your office and one in your Loft room. I can't see how wide the house is so am guessing!
So - Current Asus router, 2 cables out (go via a Switch if needed) one to each other Asus in AP mode. Brutal but that is what works for me and the house looks a similar size. I would also run at least 2 SSIDs with one of them (maybe just from the Office AP) solely as 2.4ghz. I do this because many smart devices (Ring Cameras as an example) only work on 2.4ghz and setting them up can be a pain in my experience without a specific 2.4ghz network.
Not sure I'm helping here but hope it's of some value!
Any particular Asus AP is should look at getting?
did look at these as they are similar to my router, and I can use parental controls, etc.
***Competitor link removed***
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