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(b)  B undertook a day 2 test that generated a positive result. 
(4)  Subject to paragraph 4, where P’s day 2 test and da y 8 test both generate a negative result, P 
must continue to self-isolate in accordance with the relevant self-isolation provisions until the later 
of— 
(a)  the end of the default self-isolation period; 
(b)  the day on which P receives the result of their day 8 test. 
(5)  Where a mandatory test undertaken by P generates an inconclusive result P must continue to 
self-isolate in accordance with the relevant self-isolation provisions— 
(a)  until the end of the 10th day after the day P undertook the test; 
(b)  where P undertakes a test to which sub-paragraph (7 ) applies and the test generates a 
negative result, until the later of— 
(i)  the end of the default self-isolation period, 
(ii)  the day on which P receives the negative result; or 
(c)  where P undertakes a test to which sub-paragraph (7 ) applies and the test generates a 
positive result, until the end of the 10th day after the day P undertook the test. 
(6)  Where sub-paragraph (5)(c) applies, P is not required to undertake a day 8 test in accordance 
with regulation 6. 
(7)  This sub-paragraph applies to— 
(a)  a day 8 test; 
(b)  a test— 
(i)  complying with the requirements for a day 8 test sp ecified in paragraphs 8 and 9 
(other than the requirement in paragraph 9(1)(e) th at the test be administered or 
provided to P no earlier than the end of the sevent h day after the day on which P 
arrived in England), 
(ii)  undertaken in the circumstances specified in paragr aph 10 (other than the 
circumstances in paragraph 10(2) about when a test must be undertaken), and 
(iii)  undertaken during the period specified in sub-paragraph (5)(a). 
Optional tests 
4. —(1) This paragraph applies where P— 
(a)  is a non-Schedule 11 passenger who is required to comply with regulation 9, and 
(b)  undertakes a day 2 test which generates a negative or inconclusive result. 
(2)  P may undertake a test in accordance with Schedule 10 (optional testing after arrival in 
England), and, where the test generates a negative result, P ceases to be required to self-isolate 
from the time that P is notified of that result. 
(3)  P must in any event undertake the day 8 test booked in accordance with regulation 6. 
(4)  Where P ceases to be required to self-isolate under  these Regulations in accordance with 
regulation 9(16), paragraph 3(1), (4) and (5) do not apply in relation to P’s day 8 test. 
Tests other than in accordance with these Regulations 
5. —(1) This paragraph applies where— 
(a)  P is a non-Schedule 11 passenger; 
(b)  P undertakes a day 2 test which generates a negative result; 
(c)  while P is self-isolating under these Regulations, P subsequently undertakes a test other 
than in accordance with these Regulations; and 
(d)  P is notified that such test generates a positive result.