Mike,
Good advice from Lutz, Hi-vis jackets are not required by law. But I'd take one any way in case of breakdown - it's like fitting an AL-KO stabiliser - safe rather than sorry.
Other things about Holland:
The Dutch alphabet has one additional letter - IJ - which is pronounced like the Y in EYE - so the first time you see a road sign with the town of IJmuiden listed, you won't spend 30 minutes wondering how to pronounce it (Eye-my-den) instead of concentrating on driving
And Q and X only appear in foreign words.
UK credit / debit cards are accepted almost everywhere, with the exception of railway and bus transport, parking meters, and most supermarkets, who take the Dutch Chip-n-Pin cards or money.
If you go shopping, look for VISA logos (or whatever you have) on the doorway as you enter the shop - otherwise visit an ATM.
Dutch "Chip-n-Pin" is not the UK system, but a special Dutch-only
money transfer card which Dutch people top up from special ATM machines - downloading money onto the card - the idea being that if you loose the card then you only loose the money on the card - and not give someone access to your account.
If you need any specific information, let me know.
Robert
P.S. IJ again. I was on a business trip to California with one of my guys - Eric Kooij - and the hotel receptionist just choked when he tried to pronounce Eric's name.
So, being ever helpful, I said pronounce it like it's spelt: Koo - eee - jay. So Eric was Mr. Koo - eee - jay for the rest of his stay. And when we left we let the receptionist in on the real pronunciation - it's Eric Koy.