I was pleased to see I could obtain replacement parts for my Peak Design strap system namely a replacement anchor plate and some plastic tags from Amazon, both priced at £13 each.
Peak Design Anchor mount – camera plate as adapter for peak design camera straps, etc. https://www.amazon.co.uk/Peak-Design-Anchor-Including-Adapter/dp/B074TCWG67
Peak Design Anchor Connectors for Peak Design Straps (4-Pack, 4th Generation) https://www.amazon.co.uk/Peak-Design-Anchor-Connectors-Generation/dp/B07FDSRJ51