Mhar,
When we had a permanent power outage earlier this year I just called a service and he just happened to receive the job from his employer.
After the first visit he gave me his mobile number and months later I contacted him to arrange an inspection (after two previous unsuccessful arrangements with other electricians - one never turned up and one never gave me a time and just showed up without us preparing).
I didn't mean to show a lack of confidence in the electrician. I'm just frustrated that a power outage has happened even after an inspection (which only took place earlier this week) and I don't know what the problem is this time (going to investigate if it's just a faulty appliance). I'm living with my parents; they're old and don't have that much money, so any visit from an electrician would be at their inconvenience.
Personal annoyance aside, I have been looking around my house for a bit and noticed 3 (unused) sockets turned on. I believe they've been on for 5 days since Tuesday. Do you think they could be the reason why the RCD tripped?
Also I'm based in North Somerset, so 20 or so minutes away from Bristol. I can also post test results here when I get them, if that would help anyone here.