Normally smoke from the left hand side is the pressure feed pipe rusted through where it runs in the wheel well, even on LHD cars.
However, there are two hardlines running along the body of the rack which connect the valve block to the piston. I've seen one instance (Mike's T8) where one of these lines rusted out and leaked fluid.
Other places it could leak from are the valve block itself, although thats highly unlikely, or the seal at the end of the piston which is relatively common, but that would be on the right on your car and it tends to go everywhere as it drips out of the rubber boot.
If its definitely not the pressure feed pipe then I'd say one or both of the hard lines. They're not service items unfortunately so you can't buy them separately, (and they're almost certainly different to the RHD pipes I have on the shelf) so you'd still need a replacement rack. At least it's slightly easier to change on a LHD manual...
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