“(1) Subject to regulation 5 and paragraph (1A) below, where a person claims to be entitled to any benefit, allowance or advantage (other than industrial injuries benefit or statutory sick pay) and entitlement to that benefit, allowance or advantage depends on that person being incapable of work or having limited capability for work, then in respect of each day until that person has been assessed for the purposes of the personal capability assessment or the limited capability for work assessment they shall provide evidence of such incapacity or limited capability by means of a statement given by a healthcare professional in accordance with the rules set out in Part 1 of Schedule 1 to these Regulations. (1A) Where it would be unreasonable to require a person to provide a statement in accordance with paragraph (1) above that person shall provide such other evidence as may be sufficient to show that they are incapable of work or have limited capability for work so that they should refrain (or should have refrained) from work by reason of some specific disease or bodily or mental disability.”
“(1) The evidence of incapacity or limited capability for work required for the purposes of determining entitlement to a benefit, allowance or advantage referred to in regulation 2(1) – (a). for a spell of incapacity which lasts less than 8 days, (b). in respect of any of the first 7 days of a longer spell of incapacity; (c). for a period of limited capability for work which lasts less than 8 days; or (d) in respect of any of the first 7 days of a longer period of limited capability for work, may consist of a self certificate instead of a certificate in the form of a statement in writing given by a healthcare professional in accordance with regulation 2(1). (2). For the purpose of this regulation— “self-certificate” means either— (i) a declaration made by the claimant in writing, on a form approved for the purpose by the Secretary of State; or (ii) where the claimant has made a claim for employment and support allowance in accordance with regulation 4G of theSocial Security (Claims and Payments) Regulations 1987 , an oral declaration by the claimant, that the claimant has been unfit for work from a date or for a period specified in the declaration and may include a statement that the claimant expects to continue to be unfit for work on days subsequent to the date on which it is made; … .”
“(8). In deciding an appeal under this section, the First-tier Tribunal — …; (b) shall not take into account any circumstances not obtaining at the time when the decision appealed against was made.”