I'm fine thanks. How old is the MQS? Some in my area are very old now, one estate was due to demolition back in early 90's when I did playgroup there, but it is still there now. Bet those houses have issues with electrics, as they would not have been designed for today's appliances.
As the sockets have all been tested, it is likely that you are overloading the circuit. Probably little you can do, except to unplug things that are not essential to have plugged in. I used to work in a very small office and if I wanted a coffee, I would have to turn the electric heater off before boiling the kettle. If I had both on at the same time, the electrics tripped.
Your home may have one, or two ring circuits. These will have a 30amp fuse (or 32amp MCB)at the circuit board. An Iron, Kettle, vacuum, are protected with a 13amp fuse in the plug. Other appliances will have various fuses.
If the total power consumption of the ring exceeds the circuit fuse (30amp/32amp), it will blow/trip. Therefore if you go around looking at what is plugged in, adding up all the amp ratings, with luck you will get a figure for how many amps are currently passing through the system. You may also identify power hungry appliances which you don't need on all the time - if you do find them, switch them off at the socket. By plugging in your Iron, you add another 13amp to it - which is causing the system to exceed the fuse/MCB.
I am not a qualified electrician... this is just my understanding of how it works (from reading How It Works books as a child).