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Interesting development. Its always worth putting such things into context. In this story what caught my attention most was this line,
'...The company claims waste flushed down the toilets of just 70 homes in Bristol would be enough to power it for a year, based on an annual mileage of 10,000 miles...'
Assuming these figures are accurate they give us a clear idea just how many UK cars could in theory be run on methane from UK human sewage ie a very small percentage of the total that currently exists. There are other non-fossil fuel sources of methane...animal waste, food waste of course but we are still talking about small numbers of vehicles potentially - unless we can get people to produce more sewage (after all Parliament manages to produce far more than its fair share).