When did you last test your RCD?
RCDs are potentially life saving devices, they offer protection against electrocution and can prevent electrical fires - but only when they are working! On every RCD there will be a "test" button, sometimes marked with a T, an RCD should be tested at least every 6 months by depressing the test button, this will cause the RCD to cut off the power. You can then reset the RCD and have peace of mind that it's working.
If you are unsure if your RCD is working properly, or if you don't have one in place, please don't hesitate to get in touch.