Blashfield was Mintons representative in London and a partner in the firm of Wyatt, Parker & Co of Millwall, manufacturers of cement, scagliola and mosaic pavements, which he took over in 1846.

In the early 1840s he supplied an extensive series of gothic terracotta mouldings for the English church at Bagni di Lucca in Tuscany.

In the mid 1840s he started working with leading English sculptors, most notably John Bell and William Theed the Younger, for whom he produced terracotta versions of sculptures which were originally sculpted in marble or cast in iron.

As result of the popularity of terracotta pieces at the Great Exhibition of 1851, he turned increasingly towards the manufacture of garden furniture, parapets and urns.

[11] The Wharf Road works were considerably larger than Blashfield's London premises and in the 1861 census he was calling himself Terra Cotta Manufacturer and Pottery Company and was employing 46 Men and 13 Boys.

[13] Blashfield had taken over Grant's Iron foundry in Stamford, which was in Wharf Road and adjacent to the river Welland, which was convenient for bringing clay in and shipping terracotta out.

[15] In 1865 the firm made a statue of Prince Albert from a model by William Theed the younger for the infirmary at Bishop's Waltham, Hants.

This was followed by the much more prestigious project, supplying terracotta ornament and decorative panels (designed by Colling) for the Museum of Fine Arts in Boston.

From the beginning of 1873 Blashfield was requesting money from his American clients with increasing desperation and by December 1874 the Stamford works, including models, moulds and machinery, was offered for sale.

After the collapse of the business a number of Blashfield's former employees emigrated to America, where they played an important role in the introduction of architectural terracotta.

Henry Lumby was noted as a terracotta manufacturer on a site in St Martin's, Stamford in 1868 and 1872 and in 1863 Charles Joseph Whitton had a works in London Road.