Depends where I was opening it, and locale of the area. Places like
Condor can get away with stocking high end products as they are in a High end area. If I were to open a shop in Watford, it would be more bottom to mid-range.
But, preferably: high end -
not city boy bikes (I like Bromptons, but they have, of late, been appropriated by a particular type of person in Central London): definitely a road focus. Perhaps Wilier, Enigma (love them, and if i had 4k would buy one in a flash), Pinarello and something like Colnago. Would stock the key ranges of clothing, including a widish selection of shoes and accessories (Ortlieb panniers for a start: my dad got some recently, and they're unstoppable). Thorn tourers.