Can bailiffs get monies or items from a Will?

No

When a person dies, their belongings pass to their "estate".^[1]

An enforcement agent cannot take control of goods that do not belong to the debtor.^[2]

The case will be returned to the creditor who makes a claim to the deceased executor.

^{[1] Section 1 of the Administration of Estates Act 1925
[2] Paragraph 10 of Schedule 12 of the Tribunals, Courts and Enforcement Act 2007}