I have now answered my own question. I removed the 3x T 30 screws holding on the "motor variable assist" unit, and unpluged it from the top of the wiring loom. The 22mm nut loosens and an 8mm hex key unscrews the bolt with a small pen sized seal on the end. This seal was worn and just got a new one at Bearing/Seal shop. There are also 2 small seals (pen size) that will come off with the unit, but when you fit the new ones they slot into the side of the sterring box first then install the "motor variable assist unit" back on against the steering box. Is really tricky as not much space but found using some superglue on the head of each of the 3 x screws helps when you can only use one hand! No more leaks now which is good, but have noticed a slight tightening of the steering, but I think this could be an adjustment on the 8mm hex bolt that can be screwed in and out for adjustment.