These appear to be two rod ends (heim joints), male and female threaded units connected. Unsure of size, but you have the attaching hardware to know. Unsure of material and load ratings. Manufacturers of these items run the gamut from plain carbon steel (inexpensive) to stainless steel, race-quality chrome-moly (more expensive).
In case TRG can't supply, here's one supplier:
Easy Rod End Selector rodends Heim Joint
There should be similar suppliers in the UK as well.
Hope this helps,
Sherwood