A few suggestions:
In the kitchen, run the ring 150mm above worktop height all round the room (just chase it out horizontally and mount LOTS of sockets in a row). Wherever you think anybody might ever want an appliance under the counter, mount a 20A DP switch above feeding a single 13A unswitched socket below. Don't use double sockets where someone might plug in two big undercounter appliances, such as a washing machine, dishwasher, tumble-drier or oven - a double socket will overheat if you put two big appliances through it.
Put the FCU for the cooker hood in the same row, feeding a flex outlet up high where it will not be noticed. Run all your chases vertically or horizontally, never in curves or diagonals. Put in more sockets than you think any reasonable person would want - 600mm intervals is not excessive.
Give yourself a cooker circuit, and a separate (non-RCD) 16A radial for the freezer to avoid spoilage of food due to a fault on another circuit.
In the living rooms, have (at least) a double socket in every corner, and at 2M intervals along the walls (spaced symmetrically). In a workroom or study, put sockets at worktop height as in the kitchen.
Chase out for your TV Co-ax, telephone, broadband etc even if you only put in the boxes and conduit ready for future use.
If you can afford it, use RCBOs on your socket circuits instead of a split-load. Buy good quality - Crabtree or MEM for the CU, them or MK for sockets and switches. There are some ultra-cheap brands that will save you a few pounds of money but cause you a lot of grief.
