If you're looking for
quality metal whatnots and thingamajigs,
www.leprevo.co.uk may be of interest.
Primarily a supplier of goods for leather work, there is a good selection of heavy duty fastenings at very reasonable cost. You do have to add postage and VAT, though.
And the on-line shop is
very old-school. Place an order, wait for a reply telling you the total due, then pay.