I know people have said the current superchargers won't work, only the CCS enabled ones which I assume is correct
I'd phrase that a bit differently.
Tesla converted "a couple of stalls" at Supercharger sites across EU to be Model-3-compatible, it was assumed that would take "a long time" and people started shared Google DOCs to chart progress ... but within a couple of months Tesla had done all sites across EU, including UK, bar just a handful. (quite impressive actually ...)
They then set about converting all stalls at those sites and so far (we are now another 2 or 3 months into the project) they have done about 50% of all the EU sites.
SatNav in Model-3 won't offer you a Supercharger site which has not been converted, so no risk of you rocking up at one of the few unconverted ones
When you get there you do need to find a stall (might be all of them
) which has double-hoses as that means it will have the Model-3 CCS hose.
At destination charger locations there are often several Tesla-only chargers, and at least one generic charger
No obligation to have a non-Tesla charger. As i understand it Tesla "workplace charger program" provided the chargers for free, the landlord has to provide the electricity, and cannot charge (but can restrict to "patrons only"). From memory that scheme required two chargers to be configured Tesla-only, so if the landlord only installed two chargers there wouldn't be a non-Tesla one (unless Tesla have relaxed that condition)
Typically they have Red sign for Tesla-specific, and White sign for any EV