Finally got around to going to my daughter to sort this problem. What had happened was that a cable was assumed neutral wjen in fact a live. In the picture the center blue cable should have been in the right hand , live, connector block.
I have now sleeved the errant blue in brown and the middle red in brown also. And the earths in yellow/green. Am only apportioning some blame to the guy who changed the meter as he obviously made the assumption blue was neutral.
Though he should have given some thought as to why the neutral block had only 2 ways free and the live all 3 were open. He obviously changed over the covering piece of plastic from the live block to the neutral block, so hence he was partially at fault.
Anyway all is okay now.