I'm from the UK and thankfully am reasonably comfortable with driving on the left. Because I dropped them at London, i was forced to drive like a maniac just to keep up with the general pace. So, in a way, I've taken some advice from your replies.
To my surprise, 2 of the 4 machines worked 'out the box'. Lost world and Spectrum work well with the exception of the odd lamp or sticky solenoid. This is great.
I will look into bullet-proofing those machines to ensure their survival from here.
As for Spy Hunter and Elektra. Elektra was not running since before storage, although i believe i got more flashes from the MPU before its time away. I've identified a break in the circuitry just south of U8 so will dig out the solder iron and fix.
Spy Hunter however, seems to have given up the ghost. If anyone is interested, i've made a separate post in hope of troubleshooting whats wrong here: http://pinside.com/pinball/forum/topic/bally-spy-hunter-not-starting-after-mpu-test-complete#post-1659548
Thanks again to all who posted.