For your Cooper, just because the chain is shot, doesnt mean you will need new chainrings and sprokets. Might be able to save yourself some cash.
But if you are buying some, I'd invest in quality sproket and chainrings, I am not sure about this Token brand, they have a lot of stuff in
Evans but I've never met any users. I'd go with Dura-ace sprokets and for the chainring Miche or Sugino.
If you are looking for extra's to spend money on, you will maybe want to replace cables and outers if you are giving them an annual overhaul. Re-tape your handlebars, Check your BB and headset for wear etc.