Hi,
You can't have a "factory-built" VLA since the PFA are only allowed to handle kit-built aircraft and the BMAA, while approved to process factory-built aircraft, can only handle microlights.
So, C42 Ikarus factory-built is a BMAA microlight, C42 Ikarus VLA iis a kit built and PFA.
Of course, that doesn't mean that there aren't "series-built" kits out there - where basically you are the second legal owner, although the CAA are doing their best to stamp this out. they suspect the first owners are , basically, building to order.
Very best wishes,
Colin