This problem came up a couple of weeks ago with someone else parked in an underground with no mains supply and the unit seems very handy indeed posted by asbojohn.

"You might want to take a look at one of these we have a few at work and they'll jump start a diesel transit. The problem will be getting to the battery"
http://www.cnet.com/roadshow/news/pocket-sized-jump-starters/

Similar used by Hamwich
https://www.amazon.co.uk/Suaoki-Portable...arter&psc=1

This is the whole thread
http://www.talkmorgan.com/ubbthreads.php/topics/355863/1

Welcome to TM enjoy your Morgan adventures.

2009 4/4 Sport Henrietta
1999 Indigo Blue +8
2009 4/4 Sport Green prev
1993 Con Green +8 prev