Still waiting for the new 19 RCS master to turn up, in the meantime I've done the chain & sprockets. Only my second time fitting a new chain, and the first time was on a Suzuki RG150 so the clip link was sufficient - this time round I've done it properly with the rivet link. Fortunately I've been watching quite a few of The Workshop's videos on youtube, so was well prepared to pick the correct tool and get the correct flare on the rivets.
Matt recommends getting an imitation D.I.D chain breaker tool (I picked up one of these
https://www.ebay.co.uk/itm/312758458994) and the genuine D.I.D rivet pin (KM500R -
https://www.ebay.co.uk/itm/153297890562), which I also found on ebay. Total cost was around £55 vs the £120 for the official tool and it works absolutely fine.