Volume Eleven - Pre-Victorian to the Present Day - some more aspects - Large Testing Machines in South Wales, 1829-1906 . . .

	1909 - The fire-insurance plans and aerial photographic views of the Lloyd's Bute Chain, Cable and Anchor Proving House.
	1906 - Illustrations from the Engineering periodical article 'Large Testing Machines in South Wales'.

The Glamorgan Archives hold records regarding : -

1920 - Extension to Lloyd's Proving House, Dumballs Road. - [BC/S/1/20701]

1906-1958 - Test certificates issued at the Lloyd's Proving House, Cardiff, and elsewhere. - [DLV/1]

1958, December - Shoe impression at Lloyd's Proving House, Dumballs Road, (Crime?) - [DSWP/SLI/2/9/12/6]

From the above, it would seem likely that there was commercial activity at the site until late in 1958.