I like all that sort of stuff, I watch it on the catch up services.
Repair Shop is fascinating, truly incredible skills.
Shed and Buried a bit more lighthearted but still interesting. Allen Millyard looks meek and mild but he's a mad scientist. He used to repair nuclear reactors for a living, but now he does daft stuff like making motorbikes with Dodge Viper or radial aircraft engines, and watching him reviving seemingly dead engines is engrossing.
Find it Fix It Flog it is my favourite. The delicious Gemma Longworth should have her own show. I'd even buy a TV licence to watch it if she were on the Beeb.
But anything where stuff gets restored, revived, or repurposed is popular with me and Bruce.