Copy letter from an unknown correspondent, to Messrs Parkinson & Company, City Road 'Messrs B. Donkin & Co whose name is on the valve of our gasmeter, are of the opinion that the meter itself was probably made by your firm. If this is the case, we should be glad if you would have the meter examined, as we have reason to think that it registers a very much higher figure than the actual consumption'. 23 July 1891