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There has been no construction - and i dont think it is a broken drain
Speaking to the neighbours - this problem has been there for a long ,long time .
In fact i remember , a few years after i bought the house ( i wasn't aware of the problem when i bought it ) - my next door neighbour was having an extension at the back of the house , and the builders had to have a pump to get rid of the water as they were excavating for the foundations .
Recently , another neighbour also had to have a pump , when he was extending at the back of his property