Marketing is a very tricky thing. You don't want to attract the wrong customers because this can sink you as fast as having no customers at all. You also want a decent hit rate otherwise the cost of the marketing could end up the same as the profits you're making on your jobs so you need it focused and effective.
So just as an exercise because I've never done domestic electrics so I'm not very clued up on this particular market, if I had a company that specialised in domestic CU replacements/upgrades I'd need to make my marketing tool of specific interest to people who have old type fuse boxes and I'd want my marketing to have some staying power so I'd want to get my business info out there in a format they'd want to keep rather than throw in the dustbin with all the other dozens of flyers they get.
So for example I'd maybe purchase a few 100 meter rolls of fuse wire and get some branded cardboard holders printed up and hand out branded replacement fusewire to prospective customers. This would have several advantages, it would be attractive to the prospective customer who has an old fuse type CU and they'd probably not want to throw it away and they'd probably also want to keep my marketing tool close to the actual CU where it's most relevant. The downside is that it would be more expensive than your average flyer so I'd probably go door to door manually myself to hand them out by the dozens rather than blind blanket mail drops of thousands like you would with traditional flyers. This way I could also do some market research such as how many potential customers there are with fuse boards etc and make sure the freebies are going to the right people. Also if the people you speak to have a relative or friend with a fuse board you give them extras and get them to spread your marketing items for you.
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