21. (1) Subject to subsections (2) and (3), a designated local authority shall issue a letter of assurance to a relevant owner following receipt by the designated local authority of a post works remedial works plan and a certificate of remediation under F18[section 18 or 18A, as the case may be].

(2) A letter of assurance shall be issued where—

(a) the approved remediation option, or any additional works completed by the relevant owner, did not result in the demolition of the relevant dwelling and the reconstruction of the dwelling, and

(b) the designated local authority is satisfied that the certificate of remediation is in accordance with section 20.

(3) A letter of assurance shall not be issued in respect of a second grant given under and in accordance with section 25.

(4) A letter of assurance shall state—

(a) that a certificate of remediation has been provided under F18[section 18(3) or 18A(4), as the case may be].

(b) that the owner of the relevant dwelling may make an application under section 25, and

(c) such other matters as may be prescribed for the purposes of this section.