An advertisement in The Warminster Herald, Saturday 29th November 1873:
ISAAC FELTHAM, CHITTERNE & HEYTESBURY,
BEGS most respectfully to inform Agriculturalists, Farmers, &c., in Wilts, Hants, Dorset, Somerset, Berks, Gloucester, and Oxon, that he has taken to the Business of THOMAS MERRITT, DESTROYER OF VERMIN, in Houses, Ricks, Barns, Granaries, Stables, Store-houses, &c., and who, for upwards of 20 years, has been well-known in the above Counties as the most skilful and sure killer of those Vermin so destructive in the above mentioned places.
I.F. is confident that those who honour him with a trial , will never regret it, as his receipt excels any other in the whole world. Punctuality and moderate charges will be strictly adhered to.