Squiggle, Channel 5 does split films sometimes and put a short news bulletin or entertainment news in the middle. ITV used to show the first part of a film from to to 10, then have the news, then show the second part of the film after 10.30. I wouldn't expect Film4 to do that as it doesn't have news bulletins etc.
The hygienist visit went OK and the next visit is 5 months to tie in with the checkup. After that she hopes that the hygiene visit will be every 6 months to tie in with the checkup rather than the 4 monthly it has been.