HI ian.m,
It´s normal you have those problems because your house is undepowered.
If you have a 20 amp circuit breaker the maximun power you can use is 20 amp x 230 V = 4.600 W. If you have Air con for all the house it will eat at list 4.000 W. You can use only 600 W for the iron, microwave, fridge...
I recomend you to increase you ICP (Interruptor de Control de Potencia) to avoid this problems, but it will increase your bill in the concept called "término fijo", it´s not the consume concept, it´s other concept you pay for the maximun simultaneosly power you can consume.
ICP can be manipuled for Iberdrola, that´s the reason for the tamper proof. An authorized electricist can do but you must call iberdrola to verify and tamper again (with the aditional charge)
The cost to increase your ICP power depends of your Iberdrola tariff. For usually consumers it will be:
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T.FIJO IN A
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MAX POWER
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T.FIJO
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2 MONTHS BILL
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ICP
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VOLTAGE
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ALLOWED
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€/KW/MONTH
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IVA INC
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20 AMP
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230 V
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4600 W
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9.57
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22.59
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25 AMP
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230 V
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5500 W
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11.44
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27.00
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30 AMP
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230 V
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6600 W
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13.73
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32.40
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Most people have the 25 Amp tariff without problems but make your estimations because every change on the ICP will be charged by Iberdrola in you bill about 20 €/change, but I´m not sure ask for it.
Sorry for this boring lecture. I hope at least will be usefull.
Manuel Cerezo. Visit my blog Under Construction