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Lewis, any time I've seen an RCD trip it has been due to a faulty appliance, most times the kettle. You don't need much water in the kettle mechanism to cause the RCD to trip. Our kettle is prone to leakage if overfilled, often that leakage gets around the power connections in the base and the RCD trips. A raisin from fruit loaf caught between the element and grill in our toaster has on a couple of occasions caused the RCD to trip.
The best starting point would be to turn off all power points then see if the RCD will reset. If the RCD the resets OK, turn on each one in sequence until you isolate the one that trips the RCD.
Are the lights still working? RCD's are usually only on the power point circuits and not on the lighting circuits.
It could also be leakage in your wiring or power points, I've seen ants occupy power points and light switches, crawling inside the mechanisms only to be electricuted and dye in the switch.
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