Attachment 22229
Found the instructions - so will give this a shot, also ordered the proper grease £15 for 10g from VW or £16 for 100g from BMW!
It's said to be the same ZF stuff so I went with BMW.
BMW Steering Rack Lubricating Grease 100g FB-1 2208093 83232208093
Steering Rack Grease 10g > Volkswagen ProductPart Code: G052168A1