Looks like they've just provided a reply to the list of questions on Fyi.
The most likely situation is a cliff edge exit. As of 29 March 2019, all freight leaving the UK will be unpacked and examined. Taxes (maybe 30%, or 60% if the EU decided to recoup the UKs debts through import tariffs) will need to be paid.
Are the Dutch, French, Belgians and Germans employing huge numbers of additional customs inspectors to do this? Unless there are signs of that, as of 29 March 2019, exports from the UK will be treated just like exports from every other non-EU member state (although they may get examined on a slightly more frequent rate than other countries). If the EU decides to impose punitive tariffs on the UK they'll be taken to the WTO, lose and be forced to remove them or the UK will be able to retaliate.
What's to stop rugby players wearing body armour and helmets like gridiron players, hockey players ...
One of the issues in American football is that helmets have given players a false sense of security and they're more likely to lead with their heads. Some teams are starting to experiment with helmet less practices to improve tackling technique.
Colleen McCullough (the Masters of Rome series, haven't read any of her other stuff)
+1 for Julian May and Mary Gentle
and, um, Anne Rice...
why don't Customs have a website and an online payment system?
They have. I think you'll need to register as an importer with Customs first.