Started the week by priming the outer side of the steel plates for the rear seat-back  then giving them a coat of brown.  They are now ready for fitting to the seat back.  Since then other problems have kept me away from work on the bus, plus the need for dust removal continues.  I did manage to start fitting the plates to the rear seat back, it entailed some trimming of the fabric and restapling but not a major problem, though I could have done it a better way.  No more work now until my chest problem is resolved.