I got down and dirty this afternoon with the car, went for a quick drive to make sure the oil was warmed up, then back onto the drive, tested the filler plug first, both came out with a little elbow grease. The oil was mostly grey with sort of foamy looking bits in, but it may have mixed with some of the wd40 that dripped off the plugs I undid. I replaced the oil using a piece of clear tubing fed down through the engine bay, funnel on top, worked well and saved me buying an oil pump It started to spill out of the hole just as we got to 2 litres so I assume it's spot on going by what I've read