What has altered recently? Any electrical additions or new appliances or even Christmas lights?
Do you have access to a Mega tester and an RCD ramp tester? If not it's going to be difficult to find the fault(s) unless it's something obvious. The problem is that global earth leakage is a cumulative fault so you might be looking for several smaller leakage faults and it may be that none of them on their own are large enough to cause the RCD (earth leakage breaker) to trip.
*Edit*
0111100001110 is actually a binary message and translates as 'you'll never find me without a Mega tester'.
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