A studio for anything recurring or paid, a home or garden for the occasional casual session. Both work for the right group.
A home or private garden can be free and low-admin, with no public-space licence needed on your own property, which suits tight budgets and small, casual gatherings. The trade-offs are capacity, changing and toilet access, weather cover, and doing the setup and clear-up yourself. Have an indoor backup for anything planned outdoors.
A hired studio gives you the right floor, enough space, kit on site and indoor certainty, so the logistics are largely handled. If you're planning something longer, you can look at
day retreat spaces and read up on
what a retreat involves before you commit. Public parks are trickier for paid sessions:
The Royal Parks requires a Fitness Training Licence for any commercial yoga or fitness session, whatever the group size, and operators must be insured.
Pro tip: Booking a private venue through Peerspace means you skip the public-space permit and licence hassle you'd face using a public park for a paid class.