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the main cores had about 8 strands and the new stuff had about 8 strands. the copper was also very similar in diameter. Well I have just ordered 1m of 10mm cable from ebay so will soon be able to compare!

Hmmm, the old cable had a stranded earth, but the new bit of cable had a solid earth... Yeah I see what you mean. It is the length and cable diameter that affects the volt drop. But ultimately the cable must have a low enough resistance (ie must be thick enough) so that it does not heat up...

I just ordered two of these 60 Amp junction boxes: http://www.tlc-direct.co.uk/Products/AAJB60.html This should sort it out. From what I have read, the current carrying capacity of cable is dependant on a number of things, including its length. So 6mm cable is not always a fixed 30 A...

Can anyone suggest a suitable junction box etc? I went to B&Q toninght but coulden't see anything with a high enough rating...

Hmmm, the cable runs under wooden floorboards. Its an old tenement flat. I was screwing down the squeaky floor boards when it happened! I bought some 6mm cable and its about the same thickness as the old stuff. I think the 50Amp rating may be ok for the cable. A qualified electrician...

Hi Chaps, I managed to drill through the 6mm twin and earth going to the kitchen in my flat. I cut the bad section out and have joined the two ends with a new bit of 6mm cable and some 30A rated chock block and 30A rated terminal boxes. is this ok? the mcb on the main fuse box for this cable is 50A.