HRM and Cadence

Got a Garmin Instinct and so far no issues. Stairs is a bit of a nightmare compared to the previous vivosport but who cares

looking into a running foot pod for cadence or a chest HRM. Ideally chest HRM to give me running cadence outdoors and HRM for Zwift on treadmill.

seen the Wahoo Tickr X but this is no longer made/sold in UK.

anyone have any recommendations?