7. A person who ceases to receive full-time education not before May of 1977 but before the week which contains the last Sunday in June of that year shall if—
(a)he is under the age of 17 when he so ceases; and
(b)he was not entitled to cease to attend school before the beginning of the 1977 summer term,
be treated as continuing to receive full-time education until the week which includes that Sunday; and similarly with regard to the year 1978.