Ok, an update:
- I sent the lens back, and gave them another three weeks to work on it. They changed the grease to a lighter lube, and removed the spec of dust.
- They still could give me no satisfactory answer as to what they could/would do to fix the focus problem.
- I asked them to return the lens, and refund the cost of repair.
- They have done so.
The company in question was Newton Ellis and Co. in Liverpool. Just to confirm - the work they did on the 90mm and 28mm seems very good, and I used them after a strong recommendation from a fellow RFFer who sent my old Sumicron 50 to them (which was suffering from similar focus issues) and was delighted with the results. So the only reservation I would pass on is: do not send them a 35mm pre-asph lux with focus issues. For all other service issues, they would appear perfectly competent.
Now, where next for the 35?
To Peter...or Malcolm....or to the RFF classifieds?