Jay Blades is like representing 'us' as viewers, moving from expert to expert, peering over shoulders, asking clients about their background, asking questions on our behalf, the common man amongst the experts. A mother-hen if you like. He's an expert in his own right of course, being an upholsterer/furniture restorer. Before The Repair Shop, I recognise him from the BBC daytime show 'Money For Nothing' as the resident upholstery specialist. Similar to the show in question except it's about 'upcycling' junk, such as making fish tanks out of vintage tv's or steampunk door knockers out of silver candlesticks.
https://www.bbc.co.uk/programmes/b077nzdc