Chaddyowl,
while I fully appreciate you have had an unfortunate and potentially very serious incident at your property, as a professional electrician, I would strongly advise people to take extreme care if they intend to follow your advice.
Please folks, if you don't know exactly what you are doing, DO NOT take the cover off your consumer unit and go poking around inside it, trying to tighten up terminations.
I'm not going to patronise or play the 'health and safety' card, but you are talking about lethal voltages here. If you believe you have a similar problem to Chaddyowl, please either consult a qualified professional, or at the VERY LEAST, switch the whole consumer unit off BEFORE you start poking screwdrivers around inside it.
WW