Hammy,
We’re only a small shop, without the capacity/timing for keeping on top of too many products on the webshop, so we tend to stick to things we know will prove popular for our customers and that we’re able to keep on top of stock listings on the site.
We can, of course supply many parts that aren’t listed on the site. In the case of Shimano, assuming it’s in stock we would usually see delivery to us the following day – so not a long wait.
A quick email along the lines of “can you also supply a chainset/ring/bottom bracket” would have given this answer.
We’ve used the word “package” rather than “groupset” in order to avoid this confusion. All suggestions welcomed for an alternative word!