I'd say it was probably declining demand that killed off BP Zoom. A bit like kero - nearly every servo had a drum of that at one time, and the fuel depots would have a dedicated kero pump. Try to find bulk lighting kero now...
Mower shops used to sell BP Zoom 25 too, back in the day. We used to top up the drum according to dipstick readings - the aluminium dipstick was marked with the volumes of Zoom Concentrate and Regular petrol to add. It wasn't delivered ready-mixed, at least in country areas.
There was also a Zoom 50 [50:1 mix] for outboard engines, sold at BP servos and marinas. That version was still available up to the early '00s.
Curiously, pre-packed 2-stroke fuel mix is readily available in other countries - the US [e.g. Trufuel] and UK [e.g. Aspen, Stihl], for instance. In the US, the major hardware chains like Ace Hardware, Lowes, Walmart stock it. It's pretty exy though - US$5-8 for a US Quart tin.
The driver there seems to be, that it's difficult to get ethanol-free fuel from the pump, in many localities. And these canned premixes are based on 'alkylate petrol', which has much longer shelf life than current pump petrols - it's more like Avgas.
