Big should out to the engineers at Ford. When you have to replace a bulb in a Ford-designed Jaguar, you find that (1) you can easily remove the entire headlight unit with just 3 x 10mm bolts, all easily accessed; (2) the whole unit connects to the car with a single, highly durable multipin connector; (3) the unit itself has a very logical wiring harness; (4) everything is relentlessly sealed against the incursion of water and dust; and (5) replacing the low-beam bulb requires zero extra tools.