No problem, there's nearly £200 for Triumph chain and sprockets then labour charge. I got a better quality chain and sprockets for less than £100 and fitted them myself, a much better solution! The old chain just needed a couple of links removed, sprockets were fine. But they wouldn't do the job without replacing them all. Only had just 8k on the clock then!
Don't know if things have changed but when I bought my T120 new in Oct '19 there was most of the adjustment left. After 5300 miles I've used less than a third of total chain adjustment. Maybe people complaining has worked.
It looks as though Triumph may have changed the number of teeth on the sprockets. Do you know what sprockets are now fitted? The early T120s had 17T on the front and 37T on the rear.
Still the same 17 and 37, going to change my gearing with a 39 tooth sprocket as all my riding is on lanes and not mways so more interested in acceleration than top end.