Hello OP
I completely agree with having more sockets than you think you'll need!
I've gone for sockets with separate USB charging ports built in, they are really handy.
If you've got wall-mounted TV's, mount the electric sockets on the wall directly behind them (high up).
Go for sockets on each side of beds, very handy for lights/gadget charging.
Think about how you want your bathroom light/extractor to work. Do you want them wired separately, so you can have the light on without the extractor? I put the switches on the outside because I don't like pull cords, but you may prefer motion sensor lights that don't need a switch.
Also - bathroom mirror/cabinet. It's definitely worth getting an anti-fog lighted version with an integrated shaving socket.
Would you need or like sockets in your hall or landing? Very handy for vacuum cleaning and for plugging in Christmas decorations!
Any utility rooms/cupboards that would benefit from installing a socket?
Do you have a kitchen island? Always great to have at least one double socket as the island is usually a gathering spot. Someone will want to plug something in!
Also - have a think whether you'd like to hard-wire something in that you're currently running on battery or solar. I had some garden lights hard-wired in and they are so much brighter, plus I can have them on for longer.