Most seem to rely on you using their phone app which will show you the price in kwh. I suppose it's one of those things with EV use in that you have to plan ahead before venturing out. There are apps that list all charging points (such as Zap-Map) but some of those charge points listed require you to go to the providers app to view the prices. As Tobes points out, using an EV economically does involve a lot more thinking than just pulling into a petrol station.
The other issue is the different plug/connection types (that I think reflect the charge rate?), I smugly pulled into a charge bay at our Aldi before realising that it was a different connection to my car's Type-2 plug.
There are some location that are now displaying pricing on a sign outside. For example, this location near Cherwell valley services on the A43.
Prices tend to vary by network, rather than by location, with the one exception of Tesla who do charge by location. On the rare occasion I do want to know about pricing, I tend to use the Octopus Eletroverse app. It has live pricing for most (but not all) locations.
@GaryB, I think your experience with a PHEV is different to that when you have a full EV for a couple of reasons.
1) absolute EV range. With a shorter range EV (like a PHEV) you are far more likely to be in a position where you want to charge. A 25 mile each way journey in your 40mile car would leave you out of electricity, and gets you asking the question, should I charge (which is expensive in public) or use petrol (which is always expensive), and you end up doing the latter.
With a full EV (and a range of 160 mile upwards), this event is far less likely, meaning almost all of your journeys are on home charging, which is so cheap that the occasional higher price public top up is easily bearable as its a rare occurrence.
2) The "wrong plug" thing. There are really only 3 kinds of public chargers Type 2 (that you have) Type 2 CCS (the DC variant of type 2, which you may have) and ChaDeMo, the older DC standard that is now being phased out (no new cars are available with it other than the Lexus RX idiocy).
With a "new" EV (anything over 7 years old except a Nissan Leaf or the Lexus) you will have type 2 and type 2 CCS. One is slow and you carry your own cable, the other is fast and it's built in. Again - you make the mistake once, and you learn what is good for you.