I called into Tothill Services on my way home (I didn't need to charge but did need a comfort break). There were 4 ultra rapids there asking for 59p/kWh.I too am off to Southampton soon and Tothill Services would have been a great place to stop. Still hoping it might be by then.
In Bonnet's defence, it's likely that anything you actually see on their map might work (though alas that wasn't my experience a couple of weeks ago !) whereas saying "we're paired with some Shell outlets" wouldn't be a great help.
@JoinBonnet Can you explain why Shell have that situation and is it similar for any other network ?