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About 3% percent of dwellings have rats in the garden, normally in the garden often in the compost heap.
About 5% percent of commercial buildings have rats.
About 5% percent of sewers have rats.
About 40% of agricultural buildings have rats.
The estimate is that there are somewhere around 7 million plus rural rats.
So therefore we have around 10.5 million rats and somewhere around 60 million humans in the UK.
Given the spread of rats and their numbers divided by our landspace in urban areas the current estimate is that we are never further than 50 metres from a rat. not quite so punchy a story as the old 6ft one but much more accurate!