What is the difference between a Tier 3 lockdown and a 'circuit breaker' lockdown?

manchestereveningnews.co.uk:

Here, we take a look at the differences between the Tier 3 lockdown, which has the toughest rules, versus a 'circuit breaker'. A circuit breaker lockdown would mean the whole of England is affected.Currently, large parts of the country are in Tier 1, where the only measures that need to be followed are the national rules such as 'rule of six' and the 10pm hospitality curfew.However a circuit breaker would put a stop to social mixing and all non-essential businesses would close.There would also be a ban on non-essential travel.These measures, similar to the first lockdown in March, would just be for a short-time only.Experts say it wouldn't eradicate the virus, but a few weeks' break in contact and transmission would slow down the spread of.