Among the Sussex masters who settled in Glamorganshire for the purpose of carrying on the iron manufacture, were Walter Burrell, the friend of John Ray, the naturalist, one of the Morleys of Glynde in Sussex, the Relfes from Mayfield, and the Cheneys from Crawley.
Notwithstanding these migrations of enterprising manufacturers, the iron trade of Sussex continued to exist until the middle of the seventeenth century, when the waste of timber was again urged upon the attention of Parliament, and the penalties for infringing the statutes seem to have been more rigorously enforced.

The trade then suffered a more serious check; and during the civil wars, a heavy blow was given to it by the destruction of the works belonging to all royalists, which was accomplished by a division of the army under Sir William Waller.
Most of the Welsh ironworks were razed to the ground about the same time, and were not again rebuilt.

And after the Restoration, in 1674, all the royal ironworks in the Forest of Dean were demolished, leaving only such to be supplied with ore as were beyond the forest limits; the reason alleged for this measure being lest the iron manufacture should endanger the supply of timber required for shipbuilding and other necessary purposes.
From this time the iron manufacture of Sussex, as of England generally, rapidly declined.

In 1740 there were only fifty-nine furnaces in all England, of which ten were in Sussex; and in 1788 there were only two.
A few years later, and the Sussex iron furnaces were blown out altogether.

Farnhurst, in western, and Ashburnham, in eastern Sussex, witnessed the total extinction of the manufacture.