As advised in the other steering rack thread I pulled the pre-load adjuster out, with some difficulty, it was well stuck in the rack! I turned it down in the pillar drill using the method described by DaveW and reassembled. Reading Dave’s thread again I realised I hadn’t checked the fit in the adjuster screw so pulled it out again, sure enough it was wedged tight in there too, so went through the process again.
On Saturday the new gaiter kit from Andre Koopman arrived which is a vast improvement on the original, so that will be going when I get back from the UK.