At the time of writing we have not found out which Tier Hadleigh (or in fact Babergh) will be in.
This is the Government web site where you can check when it comes back after falling over today https://www.gov.uk/find-coronavirus-local-restrictions
In the meantime here are the broad rules taken from GOV.UK
What tiers mean
Exemptions from gatherings limits in all tiers
Tier 1: Medium alert
Tier 2: High alert
Tier 3: Very High alert