That looks like your main tails to the consumer unit. Is it or the meter under where you are drilling. You have been very lucky!
Due to the nature of the cable and it's damage I'm afraid you need an electrician asap. Please keep away from the cable as it is LIVE !!
Might be worth the person who installed does! But looks like it could well be within in those zones anyway!Might be a good idea to read up on safe zones in the wiki.
I bet that was the Stanley knife used to cut away the plaster.That's very odd shaped damage to the cable as there is only one drill bit mark on the joist - and there is a cut at the top of the cable.
Indeed.Another very near miss.
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