I imagine Hornby puts a time limit on all its jobs, so if the drivers are broken and it takes too long to fix them or the device is out of production, then the unit is scrap. I spent ages fixing someone's loco but because I do it for fun. If I charged for the labour, it would be cheaper to buy a new one, even at Hornby's new prices. I assume Lendons probably uses someone that can spend more time on the units. The moral is if you can't fix it yourself, use Lendons, he is a small business and could do with the custom.