your installing electrician will spot things like earthing and bonding, which are likely to be out of date.
But often an older house will benefit from extra sockets or circuits, especially in kitchen, utility room, garage if used as workshop; or there might be external circuits for sheds or lighting that are unsatisfactory, or you might want loft lighting. If you are using adaptors or trailing sockets, that is a clue you need more outlets. I'm not sure how old your MK CU is, it looks to me to be over 30 years so the rest of the installation is presumably the same, or possibly older. Perhaps some of your sockets and switches are very old. Look for any that show signs of scorching. Maybe you have single sockets where doubles would be nicer. It does add to the cost, but better done together than later. An old installation may lack earth connections in the lighting circuit, or G&Y sheathing inside socket boxes. Lighting fittings age badly where they have been kept hot by old incandescent lamps (I am expecting this problem to disappear now that LEDs and energy saving lamps run so cool and their price has dropped).