134. Indefinite leave to remain may be granted, on application, to a person admitted as a work permit holder provided:

(i) he has spent a continuous period of 5 years in the United Kingdom in this capacity; and

(ii) he has met the requirements of paragraph 128 (i) to (v) throughout the 5 year period; and

(iii) he is still required for the employment in question, as certified by his employer; and

(iv) he has sufficient knowledge of the English language and sufficient knowledge about life in the United Kingdom, unless he is under the age of 18 or aged 65 or over at the time he makes his application.

Question : What type of documents that are counted as valid and acceptable in respect to sub-clause (iii). Would a WP extension application by Employer to Home office  be a valida document? Please  let me know all types of docs that Homeoffice accepts..