BTW, if anyone is either "F only", or wants to hedge their bets in J by getting a DC converter with Empower capabilities, I just bought one from these guys. $36 including domestic post ($50 including post to the UK).

It's new and branded but comes in the ubiquitous "white box". You get four standard tips plus a choice of 5th tip (I chose the N19 for my Dell).

US to UK plug adapter not included