Similar here, other end of Norfolk from Kelly.
I use mainly Bush who I think are also connected to Grouptyre. Like Kelly I had disinterest from WST until another garage they were supplying nearby moved away. Perhaps now this policy will work in my favour. Never come across this from any other supplier.
Also used Stapletons years ago, like for Peter, they dropped delivery to once a day.
Far to many permutations to carry stock.

Started fitting tyres about ten years ago with an old post changer. Quickly found a nearly new Sice changer and balancer at a closing sale. No problems other than fair wear & tear. Auto4 were original suppliers and have been helpful with manuals (free of charge) and a few spares.
The machine we have is basic, but with care we fit run flats and low profiles. Takes two people, extra levers and paste. I think the fancy machines allow low skill levels to operate quickly.