Tesco don't have the swipe slot, and they now train till staff to say they can't swipe cards. But it does work on the till itself (I know this because when a friend visited we made the poor till attendant try it :)).
EDIT: also, interestingly, it looks like this service only uses the chip feature, not the pin :)
Generally I've found that swipe almost always works, it's just that most people don't know that it does. (And you have to be willing to help show them how.)
The skimming just got out of hand.
In Belgium and the Netherlands, it's not usual to see supermarkets even taking credit cards, and some restaurants (!) don't either. This is changing, but slowly.
Usually I remember to get enough money from ATM's. The worst day to forget to withdraw some cash is the first of May, when it's a bit different because all the ATM's are closed to prevent the protesters from breaking them.
(And yes, this totally defeats the security aspect of C&P)
As I understand it, C&P isn't meant to be more secure for users - it's meant to be more "secure" for banks, since if someone fakes your signature it's not your fault (and the bank has to swallow the loss), but if someone gets hold of your PIN it IS your fault.
Many automated machines (e.g. gas stations) don't support swipe at all, only chip & pin.
And in Belgium, most of the terminals in smaller shop seem to be swipe-less, they're pretty big square things and only have a slot for chip-based (above the screen rather than below), no swipe slot.
In our defense: we had to, because the skimming by eastern european criminal organisations was getting out of hand. There were incidents were they completely replaced cash machienes with identically looking clones.
So, in holland, get money at a tourist bank, the airport or your hotel. Beyond those places, you cant swipe anywhere.
So, although most hardware is still technically capable to swipe, no bank is supporting it any more.
It was in response to eastern europe based organized crime, that was modifying cash machienes.
Likewise, all online bank transactions use a secondary device for authentification.
If you visit holland, and only bring a credit card, make sure you get cash at your hotel, the airport or a bank, because you cant use it anywhere else.