Under Plan B, the government expects that mandatory vaccine-only certification for visitors to venues and events, and vaccine-or-test certification for the workforce would be introduced for the following venues and events:
all nightclubs, and other venues open after 1am with alcohol, music and dancing
indoor, crowded settings with 500 or more attendees where those attendees are likely to be in close proximity to people from other households, such as music venues or large receptions
outdoor, crowded settings with 4,000 or more attendees where those attendees are likely to be in close proximity to people from other households, such as outdoor festivals
any settings with 10,000 or more attendees, such as large sports and music stadia
There are some settings that will be exempt from requirements to use the NHS COVID Pass, such as:
communal worship
wedding ceremonies
funerals
other commemorative events
Sounds reasonable if the cases are high.