"Another that should be carried at all times is the military intercept card rare to be intercepted but going international you might be."
Dover to Calais? It's equally likely you'll be abducted by aliens, frankly.
"Oh and if anyone is carrying loads of cash, rare with cost of flying declare if ask or another fine."
EU limit is 10K EUR in cash - not sure why you'd need this much on your flight to France either...
If the weather isn't great, don't go - otherwise don't sweat it. It's an easy trip (as you'll realise once you've done it!).