“(1) This section applies if — (a) A person who has limited leave to enter or remain in the United Kingdom applies to the Secretary of State for variation of the leave, (b) the application for variation is made before the leave expires, and (c) the leave expires without the application for variation having been decided. (2) The leave is extended by virtue of this section during any period when — (a) The application for variation is neither decided nor withdrawn, (b) an appeal undersection 82(1) of the Nationality, Asylum and Immigration Act 2002 could be brought while the appellant is in the United Kingdom against the decision on the application for variation (ignoring any possibility of an appeal out of time with permission), or (c) an appeal under that section against that decision, brought while the appellant is in the United Kingdom, is pending (within the meaning of section 104 of that Act). […]”
“A person lawfully in the United Kingdom under a limited right to remain and entitled to undertake employment who made a valid application to extend her leave to remain before it expired was permitted by virtue ofsection 3C of the Immigration Act 1971 to continue in employment when the leave expired pending determination of her application.”
“As already explained, immigrants who are in the United Kingdom under a limited right to remain and who make a relevant in‑time application are permitted by the legislation to continue employment pending the determination of the application.”
“According to a Code of Practice issued by the Secretary of State undersection 8A of the Asylum and Immigration Act 1996 it is lawful to employ people who were entitled to work and are awaiting the outcome of a request for an extension to that permission made before it ran out (paragraph 17). […]”
“Under the relevant immigration legislation, if a person who has limited leave to remain in the UK applies to the Secretary of State for variation of the leave and the application for variation is made before the leave expires, and the leave expires without the application for variation having been decided, the leave is extended by the legislation during any period when the application for variation is neither decided nor withdrawn: section 3C of the Immigration Act […].”
“What is my immigration status while my application is being decided? If you make an application before your authorised stay ends, your existing immigration status will continue until your application is decided, even if the decision is not made until after the end of your permitted stay. If your existing visa or other permission to stay here allows you to work, you can continue to do so until your case is decided.”
“A person seeking leave to enter the United Kingdom for the purpose of work permit employment may be admitted for a period not exceeding the period of employment approved by the Home Office (as specified in his work permit), subject to a condition restricting him to that approved employment, provided he is able to produce to the immigration officer, on arrival, a valid United Kingdom entry clearance for entry in this capacity or, where entry clearance is not required, provided the immigration officer is satisfied that each of the requirements at paragraph 128(i)‑(vi) is met.”