Hopefully, I haven't missed someone mentioning this, but the Tesla app is the one for me and a Fastned.
Tesla have now opened quite a few of them with a good distance between them even for non-tesla car owners all across UK. You save quite a bit on the prices by default and if you charge 3 or more times a month then get the membership as well and the return on it is after 75-90 kW of charge.
This summer and the last I did a 2.8k mile trip from Liverpool to Slovakia and back, where last year I was using mostly Ionity and Fastned and this summer I went with Tesla superchargers only - the difference was about a 30% reduction in charging cost (some due to price difference, some to poor planning on my side and not sticking to just one network and paying on month membership with them).
If I remember correctly in ZapMap and in the ABRP you can specifically exclude the Tesla-only superchargers or set the non-Tesla ones as preferred.
Within the Tesla app if you don't have their car registered it only shows you the ones that are open for non-tesla cars and all the status and capacity information is live and up to date, which for me is the second biggest thing after the price.
The only small problem I found was with Google maps as it shows me better information on my phone than on my computer. For example, if you search for Telse Supercharger near Stoke there are two of them, but when I click on them while on my computer they look the same and Google won't show you that one of them is Tesla only (Keele northbound services). However, if I do the same search on the Google Maps app on my Android and click on the in Trenham charger, then it shows up in the info as Non-Tesla Supercharger. Not sure why is that.
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One other thing I found out with my MG4 Throphy LR and Tesla was that in the Tesla app I have to press the "charge here" button then select the bay and the app goes into "initializing charge", only then do I pick up the cable and plug it into my car -> I had quite a few instances where plugging the cable first resulted in the handshake taking very long or failing completely. After which if I cancelled the session unplugged the car and did the steps as above the handshake happened with no problem within 10 seconds and the charging kicked off. Not sure if that is just my car or non-tesla car charging in general.
And then there is Fastned - not many of them are in the UK, yet. But worth it when going to EU. Their membership pays off after bout 50-60 Kw of charging with them within a month.
But once you put in your type of car in their app and put in the card details then you can set up "auto charge" during your first charge with them so that they remember your car and any subsequent charge is hassle-free - plug in, type the charger number into the app and walk away.
The map in their APP shows chargers from other companies and they have a route planner within their app as well. It will prioritise stopping at their chargers where possible, but for my route to Slovakia, it gave me 2x Telsa, 1x Ionity, 1x Instavolt and 6x Fastned stops. Plus you can adjust the "Personal Range" of your car within their app, which I do especially in winter to get more accurate route planning just by adjusting one slider.