Yes they can as they are an appointed "bailiff". A CEO (magistrates court bailiff) or a High Court Enforcement Officer (HCEO) can use force to gain entry to your property if you refuse to let them in or you are not in when they call.
Here is the full SP on what bailiffs and court enforcement officers can or cannot do;
A bailiff is a person who is authorised to collect a debt to the organisation/court/person to who the debt is owed.
There are different types of bailiffs and some have more powers than others.
Here is a brief overview of the law relating to bailiffs;
There are different kinds of bailiffs -
Wrongly seized property
Hope this helps.
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