Thanks for replying, The mower is a model 450589. Despite having a very good reel (replaced 12 months ago), the mower was 'grabbing' and making a grinding sound when cutting all but the shortest grass. The reel would stop rotating and then, when I raised it off the grass, it would start spinning again. I have a couch (Queensland Blue) lawn that is not thatched so I took it to the local shop for a quote to be fixed. That came back in the vicinity of 1K, so that was out of the budget. 4 Pics attached as requested.

Stuart