but in an update at 16.45 bst it said that “with regret” it has had to cancel all flights leaving from heathrow and gatwick for the rest of today.

How would the previous sentence be correctly capitalized?
Answer: But in an update at 16.45 BST it said that “with regret” it has had to cancel all flights leaving from Heathrow and Gatwick for the rest of today.
this voucher is valid until december 31st 2017, as exin, our exam provider can no longer issue certificates after this date. in total, you have 6 months to take both exams, so if you need an extension, contact mentorix atkursus@mentorix.dkfor the purpose of receiving a new voucher that can extend the examination deadline.

How would the previous sentence be correctly capitalized?
Answer: This voucher is valid until December 31st 2017, as EXIN, our exam provider can no longer issue certificates after this date. In total, you have 6 months to take both exams, so if you need an extension, contact Mentorix atkursus@mentorix.dkfor the purpose of receiving a new voucher that can extend the examination deadline.
and we finished the journey at the very pond in kosmozoo.

How would the previous sentence be correctly capitalized?
Answer: And we finished the journey at the very pond in Kosmozoo.
the flea and the professor (english) - loppen og professoren (dansk)

How would the previous sentence be correctly capitalized?
Answer: The flea and the professor (ENGLISH) - Loppen og professoren (DANSK)