I tend to plan my longer journeys, as I like to take advantage of the free chargers that are out there, rather than drop in on motorway service stations (which I've always tried to avoid). So far (9 months in), I've not had any issues with the charging infrastructure, with all my target chargers being in working order and available on arrival.
Yesterday I made a return journey to Bempton, Yorkshire (just over 300 miles). I did a couple of stops on the outward journey, 30 minutes at Tesco Alfreton (with its free 22kWh chargers) and 50 minutes at Lidl, Driffield (22kWh at 26p per kWh). First stop (Alfreton) was to grab a drink and the latter stop (Driffield) was for lunch and to top up the battery, so that I could continue to Bempton and make the return journey without any further charging stops.
That stop at Driffield was the first time I've paid to charge, whilst out and about, but the free chargers in Driffield were only 7kWh, so I was happy to pay the £4.16 for the faster charge. Total cost (including home charging) for the return journey was approximately £15.
So far, as I said, I've had no issues with the charging infrastructure but, in the future, that will obviously depend on the rollout of the charging infrastructure keeping up by the surging demand for electric vehicles.