Put this down to poor sentence structure. It implies "all black and white TVs, because of their vintage, require a set top box to receive digital television" and not "black and white TVs require a special kind of digital set top box".
Most UK contractor's day rates pay better than the majority of the bigger, time consuming projects on here. You need to be in a low cost-of-living country to take advantage of such opportunities. Most UK people just can't afford to work on such projects.